name: backport
on:
  pull_request_target:
    types: [closed, labeled]
jobs:
  backport:
    permissions:
      contents: write
      pull-requests: write
    name: Backport Pull Request
    if: github.event.pull_request.merged
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - name: Create backport PR
        id: backport
        uses: korthout/backport-action@v2
        with:
          pull_title: "${pull_title}"
          label_pattern: "^ci:backport ([^ ]+)$"
          # https://github.com/korthout/backport-action/pull/399
          experimental: >
            {
              "detect_merge_method": true
            }

      - if: ${{steps.backport.outputs.was_successful == 'true'}}
        uses: actions/github-script@v7
        with:
          script: |
            github.rest.issues.addLabels({
              issue_number: ${{steps.backport.outputs.created_pull_numbers}},
              owner: context.repo.owner,
              repo: context.repo.repo,
              labels: ['target:release']
            })