name: Clean up PR caches
on:
  pull_request_target:
    types:
      - closed

jobs:
  cleanup:
    runs-on: ubuntu-latest
    steps:
      - name: Check out code
        uses: actions/checkout@v3
      - 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 keys"
          cacheKeysForPR=$(gh actions-cache list -R $REPO -B $BRANCH | cut -f 1)

          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 }}