prs-cache-clean.yml

name: prs cache clean
on:
    pull_request:
        types:
            - closed

jobs:
    cleanup:
        runs-on: ubuntu-latest
        steps:
            - 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 }}