godot/.github/workflows/cache_cleanup.yml

# https://github.com/actions/cache/blob/main/tips-and-workarounds.md#force-deletion-of-caches-overriding-default-cache-eviction-policy
name: 🧹 Cache Cleanup
on:
  pull_request:
    types:
      - closed

jobs:
  cleanup:
    name: Cleanup PR caches
    runs-on: ubuntu-latest
    permissions:
      # `actions:write` permission is required to delete caches
      actions: write
      contents: read
    steps:
      - name: Cleanup
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          GH_REPO: ${{ github.repository }}
          BRANCH: refs/pull/${{ github.event.pull_request.number }}/merge
        run: |
          echo "Fetching list of cache key"
          cache_keys_for_pr=$(gh cache list --ref $BRANCH --limit 100 --json id --jq '.[].id')
          # Setting this to not fail the workflow while deleting cache keys.
          set +e
          echo "Deleting caches..."
          for cache_key in $cache_keys_for_pr; do
            gh cache delete $cache_key
            echo "Deleted: $cache_key"
          done
          echo "Done"