Merge #6794: ci: add SKIP_ON_PUSH and SKIP_ON_PR environment variables to build workflow

7417fb9 ci: simplify skip logic to only affect container jobs (pasta)
6d89784 ci: add SKIP_ON_PUSH and SKIP_ON_PR environment variables to build workflow (pasta)

Pull request description:

  ## Issue being fixed or feature implemented
  In DashCoreAutoGuix/dash, it's a pain to see which PRs have successfully CI, because the PR CI cancels the push CI, and GitHub UI interprets a cancel as a fail. This will allow me to configure the CI to only run the CI for the push commit, allow the CI status on the PR page to accurately reflect the true status.

  ## What was done?
  Add support for skipping CI builds based on environment variables:
  - SKIP_ON_PUSH: Skip all builds when set on push events
  - SKIP_ON_PR: Skip all builds when set on pull request events

  This provides a quick way to disable CI runs without modifying workflow files directly, useful for maintenance periods or resource management.

  ## How Has This Been Tested?
  See PastaPastaPasta#37 for this working in my fork.

  ## Breaking Changes
  None

  ## Checklist:
    _Go over all the following points, and put an `x` in all the boxes that apply._
  - [ ] I have performed a self-review of my own code
  - [ ] I have commented my code, particularly in hard-to-understand areas
  - [ ] I have added or updated relevant unit/integration/functional/e2e tests
  - [ ] I have made corresponding changes to the documentation
  - [x] I have assigned this pull request to a milestone _(for repository code-owners and collaborators only)_

ACKs for top commit:
  UdjinM6:
    utACK 7417fb9

Tree-SHA512: feef92af6bf43977e38f78370201cd21e1c4193c622e8c2b0685cf4f7c7c274b020c2cc9ff7a93f311a25676a652d3a94e5cf17ea4341b1278aa35d6bbc7ec07

Author: PastaPastaPasta

.github/workflows/build.yml

@@ -18,8 +18,29 @@ concurrency:
   cancel-in-progress: ${{ github.ref_type != 'tag' }}
 
 jobs:
+  check-skip:
+    name: Check skip conditions
+    runs-on: ubuntu-latest
+    outputs:
+      skip: ${{ steps.skip-check.outputs.skip }}
+    steps:
+      - name: Check skip environment variables
+        id: skip-check
+        run: |
+          if [[ "${{ github.event_name }}" == "push" && "${{ vars.SKIP_ON_PUSH }}" != "" ]]; then
+            echo "Skipping build on push due to SKIP_ON_PUSH environment variable"
+            echo "skip=true" >> $GITHUB_OUTPUT
+          elif [[ "${{ github.event_name }}" == "pull_request_target" && "${{ vars.SKIP_ON_PR }}" != "" ]]; then
+            echo "Skipping build on pull request due to SKIP_ON_PR environment variable"
+            echo "skip=true" >> $GITHUB_OUTPUT
+          else
+            echo "skip=false" >> $GITHUB_OUTPUT
+          fi
+
   container:
     name: Build container
+    needs: [check-skip]
+    if: ${{ needs.check-skip.outputs.skip == 'false' }}
     uses: ./.github/workflows/build-container.yml
     with:
       context: ./contrib/containers/ci
@@ -28,6 +49,8 @@ jobs:
 
   container-slim:
     name: Build slim container
+    needs: [check-skip]
+    if: ${{ needs.check-skip.outputs.skip == 'false' }}
     uses: ./.github/workflows/build-container.yml
     with:
       context: ./contrib/containers/ci