# From: https://docs.github.com/en/actions/using-workflows/caching-dependencies-to-speed-up-workflows#force-deleting-cache-entries
name: Cleanup caches by a branch
on:
  pull_request:
    types:
    - closed

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

    - name: Cleanup
      run: |
        gh extension install actions/gh-actions-cache

        REPO=${{ github.repository }}
        BRANCH="refs/pull/${{ github.event.pull_request.number }}/merge"

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

        ## Setting this to not fail the workflow while deleting cache keys.
        set +e
        echo "Deleting caches..."
        for cacheKey in $cacheKeysForPR
        do
            gh actions-cache delete $cacheKey -R $REPO -B $BRANCH --confirm
        done
        echo "Done"
      env:
        GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
