prune_cache.yaml

name: Cleanup build caches
on:
  pull_request:
    types:
      - closed
  workflow_dispatch:
    inputs:
      pr_number:
        description: 'Pull request number to clean up caches for'
        required: true
        type: string

jobs:
  cleanup:
    if: github.repository == 'OpenFUSIONToolkit/OpenFUSIONToolkit'
    runs-on: ubuntu-latest
    permissions:
      # `actions:write` permission is required to delete caches
      #   See also: https://docs.github.com/en/rest/actions/cache?apiVersion=2022-11-28#delete-a-github-actions-cache-for-a-repository-using-a-cache-id
      actions: write
      contents: read
    steps:
      - name: Check out code
        uses: actions/checkout@v5

      - name: Cleanup cache
        run: |
          gh extension install actions/gh-actions-cache

          BRANCH="refs/pull/${PR_NUMBER}/merge"

          echo "Fetching list of cache key"
          cacheKeysForPR=$(gh actions-cache list -R $REPO -B $BRANCH -L 100 | 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 }}
          REPO: ${{ github.repository }}
          PR_NUMBER: ${{ github.event.pull_request.number || inputs.pr_number }}