name: backport

on:
  pull_request_target:
    types:
      - closed
      - labeled

jobs:
  backport:
    runs-on: docker
    container:
      image: node:20-bookworm
    # Only react to merged PRs for security reasons.
    # See https://docs.github.com/en/actions/using-workflows/events-that-trigger-workflows#pull_request_target.
    if: >
      github.event.pull_request.merged
      && (
        github.event.action == 'closed'
        || (
          github.event.action == 'labeled'
          && contains(github.event.label.name, 'backport')
        )
      )
    steps:
      - name: send backport if the label "backport {branch}" is present
        if: secrets.WEBSITETOKEN != ''
        uses: https://github.com/tibdex/backport@v2
        with:
          github_token: ${{ secrets.WEBSITETOKEN }}
          head_template: 'backport/<%= base %>/pr-<%= number %>'
          label_pattern: '^backport/(?<base>([^ ]+))$'