clear-cache.yml

# Based on https://docs.github.com/en/actions/using-workflows/caching-dependencies-to-speed-up-workflows#force-deleting-cache-entries
name: '♻️ Clear GitHub Actions cache'
on:
  workflow_dispatch:
  pull_request:
    types: [ closed ]

env:
  GH_TOKEN: ${{ github.token }}

jobs:
  clear-cache:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3
      - run: gh extension install actions/gh-actions-cache
      - run: gh actions-cache list
      - name: Clear cache entries
        if: github.event_name == 'workflow_dispatch'
        run: |
          set +e
          for key in $(gh actions-cache list --sort size --order desc --limit 100 | cut -f 1 )
          do
              gh actions-cache delete $key --confirm | sed -e 's/\x1b\[[0-9;]*m//g' >> $GITHUB_STEP_SUMMARY
          done
      - name: Clear cache entries from PR
        if: github.event_name == 'pull_request'
        run: |
          set +e
          BRANCH="refs/pull/${{ github.event.pull_request.number }}/merge"
          for key in $(gh actions-cache list --sort size --order desc --limit 100 --branch $BRANCH | cut -f 1 )
          do
              gh actions-cache delete $key --branch $BRANCH --confirm | sed -e 's/\x1b\[[0-9;]*m//g' >> $GITHUB_STEP_SUMMARY
          done
      - run: gh actions-cache list