port_merged_pull_request.yml

# This workflow will attempt to port a merged pull request to
# the branch specified in a "port to" label (if exists)
name: Port merged Pull Request

# Only run for merged PRs against the "main" or maintenance branches
# We allow this to run for `pull_request_target` so that github secrets are available
# (This is required when the PR comes from a forked repo)
on:
  pull_request_target:
    types: [ closed ]
    branches:
      - main
      - 'dspace-**'

permissions:
  contents: write      # so action can add comments
  pull-requests: write # so action can create pull requests

jobs:
  port_pr:
    runs-on: ubuntu-latest
    # Don't run on closed *unmerged* pull requests
    if: github.event.pull_request.merged
    steps:
      # Checkout code
      - uses: actions/checkout@v3
      # Port PR to other branch (ONLY if labeled with "port to")
      # See https://github.com/korthout/backport-action
      - name: Create backport pull requests
        uses: korthout/backport-action@v1
        with:
          # Trigger based on a "port to [branch]" label on PR
          # (This label must specify the branch name to port to)
          label_pattern: '^port to ([^ ]+)$'
          # Title to add to the (newly created) port PR
          pull_title: '[Port ${target_branch}] ${pull_title}'
          # Description to add to the (newly created) port PR
          pull_description: 'Port of #${pull_number} by @${pull_author} to `${target_branch}`.'
          # Copy all labels from original PR to (newly created) port PR
          # NOTE: The labels matching 'label_pattern' are automatically excluded
          copy_labels_pattern: '.*'
          # Skip any merge commits in the ported PR. This means only non-merge commits are cherry-picked to the new PR
          merge_commits: 'skip'
          # Use a personal access token (PAT) to create PR as 'dspace-bot' user.
          # A PAT is required in order for the new PR to trigger its own actions (for CI checks)
          github_token: ${{ secrets.PR_PORT_TOKEN }}