clear-cache.yaml

# 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_REPO: ${{ github.repository }}
  GH_TOKEN: ${{ github.token }}

jobs:
  clear-cache:
    runs-on: ubuntu-latest
    timeout-minutes: 5
    steps:
      - run: gh extension install actions/gh-actions-cache
      - name: Clear cache entries
        if: github.event_name == 'workflow_dispatch'
        run: |
            set +e
            while :
            do
              entries=($(gh actions-cache list --sort size --order desc --limit 100 | cut -f 1))
              if ((!${#entries[@]})); then break; fi
              for key in "${entries[@]}"
              do
                gh actions-cache delete "$key" --confirm | sed -e 's/\x1b\[[0-9;]*m//g' | sed -e 's/^/- /' >> $GITHUB_STEP_SUMMARY
              done
            done
      - name: Clear cache entries from PR
        if: github.event_name == 'pull_request'
        env:
          BRANCH: refs/pull/${{ github.event.pull_request.number }}/merge
        run: |
            set +e
            while :
            do
              entries=($(gh actions-cache list --sort size --order desc --limit 100 --branch "$BRANCH" | cut -f 1))
              if ((!${#entries[@]})); then break; fi
              for key in "${entries[@]}"
              do
                gh actions-cache delete "$key" --branch "$BRANCH" --confirm | sed -e 's/\x1b\[[0-9;]*m//g' | sed -e 's/^/- /' >> $GITHUB_STEP_SUMMARY
              done
            done