backport.yaml

name: Backport

# Backport changes to more release branches based on labels on merged PRs.
# For instance, backport/3.5 or backport/3.6 would create new PRs for review on those branches.
# Still experimental on Jobbergate.
# Inspired on Poetry: https://github.com/python-poetry/poetry/blob/master/.github/workflows/backport.yaml

on:
  pull_request_target:
    types:
      - closed
      - labeled

jobs:
  backport:
    name: Backport
    runs-on: ubuntu-latest
    # 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: Generate backport
        uses: tibdex/backport@v2
        with:
          github_token: ${{ secrets.TOKEN }}
          title_template: "[<%= base %>] <%= title %>"
          label_pattern: "^backport/(?<base>([^ ]+))$"