cache-clear.yml

name: "cleanup caches by a branch"

on: # yamllint disable-line rule:truthy
    pull_request:
        types:
            - "closed"

jobs:
    cleanup:
        runs-on: "ubuntu-latest"
        steps:
            - name: "Harden Runner"
              uses: "step-security/harden-runner@eb238b55efaa70779f274895e782ed17c84f2895" # v2.6.1
              with:
                  egress-policy: "audit"

            - name: "Check out code"
              uses: "actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11" # v4.1.1

            - 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 }}"