clean-up-pr-caches.yml

# https://docs.github.com/en/actions/using-workflows/caching-dependencies-to-speed-up-workflows#force-deleting-cache-entries
name: Cleanup caches for closed branches

on:
  pull_request:
    types: [closed]
  workflow_dispatch:

jobs:
  cleanup:
    runs-on: ubuntu-latest
    steps:
      - name: Check out code
        uses: actions/checkout@v4

      - name: 🧹 Cleanup caches
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          REPO: ${{ github.repository }}
          BRANCH: refs/pull/${{ github.event.pull_request.number }}/merge
        run: |
          # Install GitHub CLI cache extension
          gh extension install actions/gh-actions-cache

          echo "Fetching list of cache keys..."
          cacheKeys=$(gh actions-cache list -R $REPO -B $BRANCH | cut -f 1)

          # Continue even if some cache deletions fail
          set +e
          
          if [ -z "$cacheKeys" ]; then
            echo "No caches found to delete"
            exit 0
          fi

          echo "Deleting caches..."
          for cacheKey in $cacheKeys; do
            echo "Deleting cache: $cacheKey"
            gh actions-cache delete "$cacheKey" -R $REPO -B $BRANCH --confirm
          done
          
          echo "Cache cleanup completed"