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Optimize CI with change-driven gating (#1902)
Why Reduce GitHub Actions usage and provide faster PR feedback. Summary Implements intelligent CI gating that skips irrelevant tests on branches while maintaining full coverage on master. Adds local testing tools. Key improvements - Smart change detection skips docs-only PRs and irrelevant tests - Reduced test matrix on PRs (latest versions) saves ~73% time - Local CI tools (bin/ci-local, script/ci-changes-detector) test before push Impact Existing: PR CI runs in ~12 min instead of ~45 min for code changes New: Contributors can validate changes locally, preventing CI failures Risks None. Backward compatible. Master branch retains full test coverage.
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‎.claude/commands/run-ci.md‎

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# Run CI Command
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Analyze the current branch changes and run appropriate CI checks locally.
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## Instructions
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1. First, run `script/ci-changes-detector origin/master` to analyze what changed
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2. Show the user what the detector recommends
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3. Ask the user if they want to:
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- Run the recommended CI jobs (`bin/ci-local`)
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- Run all CI jobs (`bin/ci-local --all`)
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- Run a fast subset (`bin/ci-local --fast`)
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- Run specific jobs manually
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4. Execute the chosen option and report results
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5. If any jobs fail, offer to help fix the issues
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## Options
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- `bin/ci-local` - Run CI based on detected changes
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- `bin/ci-local --all` - Run all CI checks (same as CI on master)
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- `bin/ci-local --fast` - Run only fast checks, skip slow integration tests
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- `bin/ci-local [base-ref]` - Compare against a specific ref instead of origin/master

‎.github/workflows/detect-changes.yml‎

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name: Detect Changes
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on:
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workflow_call:
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outputs:
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docs_only:
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description: 'Only documentation files changed'
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value: ${{ jobs.detect.outputs.docs_only }}
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run_lint:
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description: 'Should run linting'
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value: ${{ jobs.detect.outputs.run_lint }}
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run_ruby_tests:
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description: 'Should run Ruby tests'
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value: ${{ jobs.detect.outputs.run_ruby_tests }}
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run_js_tests:
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description: 'Should run JS tests'
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value: ${{ jobs.detect.outputs.run_js_tests }}
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run_dummy_tests:
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description: 'Should run dummy app tests'
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value: ${{ jobs.detect.outputs.run_dummy_tests }}
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run_generators:
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description: 'Should run generator tests'
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value: ${{ jobs.detect.outputs.run_generators }}
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jobs:
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detect:
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runs-on: ubuntu-22.04
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outputs:
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docs_only: ${{ steps.changes.outputs.docs_only }}
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run_lint: ${{ steps.changes.outputs.run_lint }}
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run_ruby_tests: ${{ steps.changes.outputs.run_ruby_tests }}
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run_js_tests: ${{ steps.changes.outputs.run_js_tests }}
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run_dummy_tests: ${{ steps.changes.outputs.run_dummy_tests }}
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run_generators: ${{ steps.changes.outputs.run_generators }}
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steps:
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- uses: actions/checkout@v4
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with:
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fetch-depth: 0
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persist-credentials: false
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- name: Detect changes
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id: changes
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run: |
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# For master branch, always run everything
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if [ "${{ github.ref }}" = "refs/heads/master" ]; then
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echo "docs_only=false" >> "$GITHUB_OUTPUT"
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echo "run_lint=true" >> "$GITHUB_OUTPUT"
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echo "run_ruby_tests=true" >> "$GITHUB_OUTPUT"
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echo "run_js_tests=true" >> "$GITHUB_OUTPUT"
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echo "run_dummy_tests=true" >> "$GITHUB_OUTPUT"
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echo "run_generators=true" >> "$GITHUB_OUTPUT"
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exit 0
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fi
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# For PRs, analyze changes
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BASE_SHA="${{ github.event.pull_request.base.sha || github.event.before }}"
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script/ci-changes-detector "$BASE_SHA"

‎.github/workflows/examples.yml‎

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push:
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branches:
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- 'master'
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paths-ignore:
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- '**.md'
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- 'docs/**'
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pull_request:
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paths-ignore:
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- '**.md'
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- 'docs/**'
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jobs:
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detect-changes:
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runs-on: ubuntu-22.04
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outputs:
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docs_only: ${{ steps.detect.outputs.docs_only }}
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run_lint: ${{ steps.detect.outputs.run_lint }}
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run_js_tests: ${{ steps.detect.outputs.run_js_tests }}
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run_ruby_tests: ${{ steps.detect.outputs.run_ruby_tests }}
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run_dummy_tests: ${{ steps.detect.outputs.run_dummy_tests }}
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run_generators: ${{ steps.detect.outputs.run_generators }}
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steps:
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- uses: actions/checkout@v4
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with:
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# Fetch enough history for change detection (50 commits is usually sufficient for PRs)
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fetch-depth: 50
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persist-credentials: false
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- name: Detect relevant changes
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id: detect
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run: |
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BASE_REF="${{ github.event.pull_request.base.sha || github.event.before || 'origin/master' }}"
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script/ci-changes-detector "$BASE_REF"
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shell: bash
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examples:
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needs: detect-changes
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if: github.ref == 'refs/heads/master' || needs.detect-changes.outputs.run_generators == 'true'
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strategy:
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fail-fast: false
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matrix:
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ruby-version: ['3.2', '3.4']
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dependency-level: ['minimum', 'latest']
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include:
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- ruby-version: '3.2'
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dependency-level: 'minimum'
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# Always run: Latest versions (fast feedback on PRs)
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- ruby-version: '3.4'
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dependency-level: 'latest'
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exclude:
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# Master only: Minimum supported versions (full coverage)
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- ruby-version: '3.2'
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dependency-level: 'latest'
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- ruby-version: '3.4'
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dependency-level: 'minimum'
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env:
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SKIP_YARN_COREPACK_CHECK: 0
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- uses: actions/checkout@v4
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with:
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persist-credentials: false
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- name: Get changed files
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id: changed-files
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run: |
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BASE_SHA=${{ github.event.pull_request.base.sha || github.event.before }}
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git fetch origin $BASE_SHA
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CHANGED_FILES=$(git diff --name-only $BASE_SHA ${{ github.sha }} -- \
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lib/generators/ \
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rakelib/example_type.rb \
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rakelib/example_config.yml \
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rakelib/examples.rake \
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rakelib/run_rspec.rake)
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if [ -n "$CHANGED_FILES" ]; then
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ANY_CHANGED=true
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else
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ANY_CHANGED=false
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fi
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echo "any_changed=$ANY_CHANGED" >> "$GITHUB_OUTPUT"
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- name: Setup Ruby
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uses: ruby/setup-ruby@v1
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with:
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run: |
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echo "CI_DEPENDENCY_LEVEL=${{ matrix.dependency-level }}" >> $GITHUB_ENV
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- name: Main CI
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if: steps.changed-files.outputs.any_changed == 'true'
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run: bundle exec rake run_rspec:shakapacker_examples
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- name: Store test results
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uses: actions/upload-artifact@v4

‎.github/workflows/lint-js-and-ruby.yml‎

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push:
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branches:
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- 'master'
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paths-ignore:
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- '**.md'
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- 'docs/**'
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pull_request:
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paths-ignore:
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- '**.md'
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- 'docs/**'
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jobs:
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detect-changes:
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runs-on: ubuntu-22.04
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outputs:
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docs_only: ${{ steps.detect.outputs.docs_only }}
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run_lint: ${{ steps.detect.outputs.run_lint }}
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run_js_tests: ${{ steps.detect.outputs.run_js_tests }}
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run_ruby_tests: ${{ steps.detect.outputs.run_ruby_tests }}
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run_dummy_tests: ${{ steps.detect.outputs.run_dummy_tests }}
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run_generators: ${{ steps.detect.outputs.run_generators }}
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steps:
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- uses: actions/checkout@v4
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with:
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fetch-depth: 0
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persist-credentials: false
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- name: Detect relevant changes
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id: detect
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run: |
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BASE_REF="${{ github.event.pull_request.base.sha || github.event.before || 'origin/master' }}"
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script/ci-changes-detector "$BASE_REF"
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shell: bash
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build:
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needs: detect-changes
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if: github.ref == 'refs/heads/master' || needs.detect-changes.outputs.run_lint == 'true'
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env:
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BUNDLE_FROZEN: true
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runs-on: ubuntu-22.04
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steps:
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- uses: actions/checkout@v4
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with:
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# No need for history in lint job
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fetch-depth: 1
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persist-credentials: false
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- name: Setup Ruby
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uses: ruby/setup-ruby@v1

‎.github/workflows/main.yml‎

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push:
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branches:
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- 'master'
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paths-ignore:
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- '**.md'
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- 'docs/**'
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pull_request:
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paths-ignore:
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- '**.md'
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- 'docs/**'
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jobs:
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detect-changes:
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runs-on: ubuntu-22.04
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outputs:
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docs_only: ${{ steps.detect.outputs.docs_only }}
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run_lint: ${{ steps.detect.outputs.run_lint }}
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run_js_tests: ${{ steps.detect.outputs.run_js_tests }}
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run_ruby_tests: ${{ steps.detect.outputs.run_ruby_tests }}
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run_dummy_tests: ${{ steps.detect.outputs.run_dummy_tests }}
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run_generators: ${{ steps.detect.outputs.run_generators }}
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steps:
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- uses: actions/checkout@v4
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with:
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# Fetch enough history for change detection (50 commits is usually sufficient for PRs)
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fetch-depth: 50
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persist-credentials: false
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- name: Detect relevant changes
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id: detect
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run: |
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BASE_REF="${{ github.event.pull_request.base.sha || github.event.before || 'origin/master' }}"
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script/ci-changes-detector "$BASE_REF"
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shell: bash
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build-dummy-app-webpack-test-bundles:
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needs: detect-changes
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# Run on master OR when tests needed on PR (but skip minimum deps on PR)
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if: |
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(github.ref == 'refs/heads/master' || needs.detect-changes.outputs.run_dummy_tests == 'true')
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strategy:
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matrix:
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ruby-version: ['3.2', '3.4']
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node-version: ['20', '22']
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include:
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- ruby-version: '3.2'
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node-version: '20'
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dependency-level: 'minimum'
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# Always run: Latest versions (fast feedback on PRs)
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- ruby-version: '3.4'
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node-version: '22'
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dependency-level: 'latest'
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exclude:
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# Master only: Minimum supported versions (full coverage)
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- ruby-version: '3.2'
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node-version: '22'
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- ruby-version: '3.4'
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node-version: '20'
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dependency-level: 'minimum'
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runs-on: ubuntu-22.04
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steps:
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- uses: actions/checkout@v4
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key: dummy-app-webpack-bundle-${{ steps.get-sha.outputs.sha }}-ruby${{ matrix.ruby-version }}-${{ matrix.dependency-level }}
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dummy-app-integration-tests:
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needs: build-dummy-app-webpack-test-bundles
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needs: [detect-changes, build-dummy-app-webpack-test-bundles]
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# Run on master OR when tests needed on PR (but skip minimum deps on PR)
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if: |
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(github.ref == 'refs/heads/master' || needs.detect-changes.outputs.run_dummy_tests == 'true')
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strategy:
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fail-fast: false
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matrix:
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ruby-version: ['3.2', '3.4']
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node-version: ['20', '22']
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include:
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- ruby-version: '3.2'
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node-version: '20'
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dependency-level: 'minimum'
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# Always run: Latest versions (fast feedback on PRs)
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- ruby-version: '3.4'
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node-version: '22'
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dependency-level: 'latest'
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exclude:
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# Master only: Minimum supported versions (full coverage)
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- ruby-version: '3.2'
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node-version: '22'
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- ruby-version: '3.4'
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node-version: '20'
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dependency-level: 'minimum'
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runs-on: ubuntu-22.04
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steps:
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- uses: actions/checkout@v4

‎.github/workflows/package-js-tests.yml‎

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push:
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branches:
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- 'master'
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paths-ignore:
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- '**.md'
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- 'docs/**'
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- 'lib/**'
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- 'spec/react_on_rails/**'
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pull_request:
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paths-ignore:
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- '**.md'
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- 'docs/**'
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- 'lib/**'
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- 'spec/react_on_rails/**'
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jobs:
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detect-changes:
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runs-on: ubuntu-22.04
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outputs:
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docs_only: ${{ steps.detect.outputs.docs_only }}
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run_lint: ${{ steps.detect.outputs.run_lint }}
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run_js_tests: ${{ steps.detect.outputs.run_js_tests }}
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run_ruby_tests: ${{ steps.detect.outputs.run_ruby_tests }}
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run_dummy_tests: ${{ steps.detect.outputs.run_dummy_tests }}
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run_generators: ${{ steps.detect.outputs.run_generators }}
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steps:
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- uses: actions/checkout@v4
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with:
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# Fetch enough history for change detection (50 commits is usually sufficient for PRs)
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fetch-depth: 50
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persist-credentials: false
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- name: Detect relevant changes
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id: detect
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run: |
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BASE_REF="${{ github.event.pull_request.base.sha || github.event.before || 'origin/master' }}"
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script/ci-changes-detector "$BASE_REF"
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shell: bash
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build:
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needs: detect-changes
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# Run on master OR when JS tests needed on PR (but skip Node 20 on PR)
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if: |
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(github.ref == 'refs/heads/master' || needs.detect-changes.outputs.run_js_tests == 'true')
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strategy:
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matrix:
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node-version: ['20', '22']
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include:
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# Always run: Latest Node version (fast feedback on PRs)
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- node-version: '22'
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# Master only: Minimum supported Node version (full coverage)
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- node-version: '20'
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runs-on: ubuntu-22.04
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steps:
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- uses: actions/checkout@v4

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