prs-cache-clean.yml

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

permissions:
  actions: write
  checks: read
  contents: read
  deployments: read
  issues: read
  discussions: read
  packages: read
  pages: read
  pull-requests: read
  repository-projects: read
  security-events: read
  statuses: read

jobs:
  cleanup:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@c85c95e3d7251135ab7dc9ce3241c5835cc595a9 # v3.5.3

      - 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 }}