cleanup-caches.yml

name: Cleanup caches on closed PRs
# From https://docs.github.com/en/actions/writing-workflows/choosing-what-your-workflow-does/caching-dependencies-to-speed-up-workflows#matching-a-cache-key
on:
  pull_request_target:
    types: [ closed ]
jobs:
  cleanup:
    runs-on: ubuntu-latest
    permissions:
      actions: write
    steps:
      - name: Cleanup
        run: |
          echo "Fetching list of cache keys"
          cacheKeysForPR=$(gh cache list --ref $BRANCH --limit 100 --json id --jq '.[].id')
          while [ "$cacheKeysForPR" ]; do
            for cacheKey in $cacheKeysForPR; do
                echo gh cache delete $cacheKey
                gh cache delete $cacheKey
            done
            cacheKeysForPR=$(gh cache list --ref $BRANCH --limit 100 --json id --jq '.[].id')
          done
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          GH_REPO: ${{ github.repository }}
          BRANCH: refs/pull/${{ github.event.pull_request.number }}/merge