name: Cleanup github runner caches on closed pull requests
on:
  workflow_dispatch:
    inputs:
      pr_number:
        description: 'PR number to clean caches for'
        required: true
        type: string

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')

          ## Setting this to not fail the workflow while deleting cache keys.
          set +e
          echo "Deleting caches..."
            while IFS= read -r cacheKey; do
              gh cache delete "$cacheKey"
            done <<< "$cacheKeysForPR"
          echo "Done"
        env:
          GH_TOKEN: ${{ github.token }}
          GH_REPO: ${{ github.repository }}
          BRANCH: refs/pull/${{ inputs.pr_number }}/merge