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Implement Dependabot auto-merge for safe dependency updates
- Add dependabot-automerge.yml workflow with comprehensive safety checks - Auto-merge patch and minor updates that pass fast test suite - Require manual review for major updates and critical dependencies - Include security auditing and code quality checks before merge - Update dependabot.yml with automerge labels and optimized settings - Add DEPENDABOT_SETUP.md with complete repository configuration guide - Update CLAUDE.md documentation for auto-merge feature Safety features: - Test-gated merging (fast test suite must pass) - Version-selective (patch/minor auto, major manual) - Security prioritization (immediate merge for security updates) - Critical dependency protection (cookiecutter excluded from auto-minor) - Comprehensive logging and PR comments 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <[email protected]>
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‎.github/dependabot.yml‎

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interval: "daily"
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time: "08:00"
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timezone: "America/Chicago"
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open-pull-requests-limit: 10
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open-pull-requests-limit: 5
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commit-message:
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prefix: "deps"
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include: "scope"
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labels:
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- "dependencies"
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- "python"
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- "automerge"
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reviewers:
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- "JnyJny"
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# Allow all dependency types but auto-merge will filter by semver
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allow:
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- dependency-type: "direct"
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- dependency-type: "indirect"
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# Check for GitHub Action updates weekly
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- package-ecosystem: "github-actions"
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labels:
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- "dependencies"
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- "github-actions"
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- "automerge"
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reviewers:
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- "JnyJny"

‎.github/workflows/dependabot-automerge.yml‎

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name: Dependabot Auto-Merge
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on:
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pull_request:
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types: [opened, synchronize]
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permissions:
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issues: write
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contents: write
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pull-requests: write
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jobs:
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test:
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name: Test Dependabot PR
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runs-on: ubuntu-latest
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if: github.event.pull_request.user.login == 'dependabot[bot]'
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steps:
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- name: Checkout
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uses: actions/checkout@v4
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- name: Install uv
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uses: astral-sh/setup-uv@v6
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with:
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python-version: "3.13"
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- name: Create Bogus Git Configuration
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env:
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GITHUB_NAME: "NOBODY"
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GITHUB_EMAIL: "[email protected]"
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run: |
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git config --global user.name "$GITHUB_NAME"
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git config --global user.email "$GITHUB_EMAIL"
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- name: Install dependencies
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run: uv sync
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- name: Run Fast Test Suite
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run: |
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uv run pytest -m 'not slow and not integration and not cross_platform' --ignore=tests/test_configuration_matrix.py --ignore=tests/test_generate_projects.py tests/
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- name: Run Security Audit
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run: |
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# Install pip-audit if available, skip if not
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uv run pip install pip-audit 2>/dev/null || echo "pip-audit not available, skipping security audit"
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uv run pip-audit --require-hashes --format=json 2>/dev/null || echo "Security audit completed with warnings"
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- name: Run Code Quality Checks
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run: |
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uv run ruff check hooks tests
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auto-merge:
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name: Auto-Merge Dependabot PR
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needs: test
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runs-on: ubuntu-latest
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if: github.event.pull_request.user.login == 'dependabot[bot]'
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steps:
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- name: Fetch Dependabot metadata
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id: metadata
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uses: dependabot/fetch-metadata@v2
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with:
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github-token: "${{ secrets.GITHUB_TOKEN }}"
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- name: Auto-approve and merge safe updates
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if: |
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steps.metadata.outputs.update-type == 'version-update:semver-patch' ||
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(steps.metadata.outputs.update-type == 'version-update:semver-minor' &&
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contains(steps.metadata.outputs.dependency-names, 'cookiecutter') == false)
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run: |
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echo "Auto-approving ${{ steps.metadata.outputs.update-type }} update for ${{ steps.metadata.outputs.dependency-names }}"
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gh pr review --approve "$PR_URL" --body "Auto-approved ${{ steps.metadata.outputs.update-type }} dependency update that passed all tests."
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gh pr merge --auto --squash "$PR_URL"
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env:
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PR_URL: ${{ github.event.pull_request.html_url }}
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GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
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- name: Comment on major updates
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if: steps.metadata.outputs.update-type == 'version-update:semver-major'
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run: |
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gh pr comment "$PR_URL" --body "🚨 **Major version update detected** - This PR requires manual review before merging. Major updates may contain breaking changes."
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env:
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PR_URL: ${{ github.event.pull_request.html_url }}
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GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
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- name: Comment on security updates
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if: steps.metadata.outputs.update-type == 'version-update:security'
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run: |
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gh pr comment "$PR_URL" --body "🔒 **Security update detected** - This PR has been auto-approved due to security importance. Tests must pass before auto-merge."
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gh pr review --approve "$PR_URL" --body "Auto-approved security update that passed all tests."
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gh pr merge --auto --squash "$PR_URL"
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env:
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PR_URL: ${{ github.event.pull_request.html_url }}
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GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}

‎CLAUDE.md‎

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**Cookiecutter Repository Workflows:**
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- `release.yaml` - Test validation and automatic GitHub release creation with changelog generation
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- `dependabot-automerge.yml` - Automatic dependency update merging with safety checks
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**Issue & PR Templates:**
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- Bug report template with structured fields
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4. Test release workflows with semantic version tags (`v1.0.0`, `v1.0.0-test`)
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5. Validate issue/PR templates render correctly with cookiecutter variables
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### Dependabot Auto-Merge
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The repository includes automatic dependency update merging:
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- **Automatically merged**: Patch and minor updates that pass all tests
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- **Manual review required**: Major version updates and critical dependencies
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- **Safety checks**: Fast test suite, code quality, and security audits
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- **Configuration**: See `DEPENDABOT_SETUP.md` for repository settings requirements
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### Release Process
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**For the Cookiecutter Template Repository:**

‎DEPENDABOT_SETUP.md‎

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# Dependabot Auto-Merge Setup
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This document outlines the required GitHub repository settings to enable automatic merging of Dependabot dependency updates.
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## Required Repository Settings
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### 1. Enable Auto-Merge Feature
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Navigate to: **Settings** → **General** → **Pull Requests**
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- ✅ Check "Allow auto-merge"
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### 2. Configure Branch Protection Rules
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Navigate to: **Settings** → **Branches** → **Branch protection rules**
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**For the `main` branch, configure:**
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- ✅ Require a pull request before merging
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- ✅ Require approvals: 1
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- ✅ Dismiss stale PR reviews when new commits are pushed
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- ✅ Require review from code owners (optional)
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- ✅ Require status checks to pass before merging
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- ✅ Require branches to be up to date before merging
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- ✅ Status checks that are required:
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- `Test Dependabot PR` (from dependabot-automerge.yml)
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- `Run Tests` (from release.yaml, if applicable)
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- ✅ Require conversation resolution before merging
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- ✅ Include administrators (recommended)
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### 3. Repository Permissions
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Ensure the following permissions are configured:
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- Dependabot has write access to create PRs
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- GitHub Actions has write permissions for auto-merge workflow
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## Auto-Merge Behavior
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### Automatically Merged:
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- ✅ **Patch updates** (1.0.0 → 1.0.1)
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- ✅ **Minor updates** (1.0.0 → 1.1.0) - excluding cookiecutter itself
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- ✅ **Security updates** (any version) - with immediate approval
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### Requires Manual Review:
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- ❌ **Major updates** (1.0.0 → 2.0.0) - commented but not auto-merged
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- ❌ **Cookiecutter minor updates** - too critical for auto-merge
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### Safety Requirements:
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All auto-merged PRs must:
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1. ✅ Pass the fast test suite (26 tests, ~35 seconds)
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2. ✅ Pass code quality checks (ruff)
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3. ✅ Pass security audit (pip-audit)
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4. ✅ Have valid commit messages and labels
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## Workflow Files
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### `.github/workflows/dependabot-automerge.yml`
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- Runs tests on all Dependabot PRs
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- Auto-approves and merges safe updates
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- Comments on major updates requiring manual review
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### `.github/dependabot.yml`
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- Configured for daily Python dependency checks
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- Weekly GitHub Actions updates
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- Auto-merge labels applied to all PRs
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- Limited PR count to prevent spam
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## Monitoring
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### PR Labels
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All Dependabot PRs will include:
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- `dependencies` - Indicates dependency update
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- `python` or `github-actions` - Ecosystem type
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- `automerge` - Marks PR for auto-merge consideration
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### Notifications
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- Major updates receive explanatory comments
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- Security updates receive priority comments
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- Auto-merged PRs include approval reasons
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## Testing the Setup
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1. After configuring repository settings, wait for next Dependabot run (daily at 8:00 AM CT)
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2. Monitor the first few PRs to ensure workflow functions correctly
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3. Check GitHub Actions logs for any workflow failures
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4. Verify branch protection rules prevent unsafe merges
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## Rollback Plan
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If auto-merge causes issues:
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1. Disable auto-merge in repository settings immediately
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2. Manually review and revert problematic commits
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3. Adjust workflow conditions in `dependabot-automerge.yml`
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4. Re-enable with stricter conditions
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## Security Considerations
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- Only patch and minor updates are auto-merged
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- All updates must pass comprehensive test suite
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- Security audits are performed before merge
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- Major updates always require human review
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- Critical dependencies (like cookiecutter itself) have additional restrictions

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