port-to-prerelease.yml

name: Port change to prerelease
on:
  pull_request_target:
    types: [closed]
  issue_comment:
    types: [created]

permissions:
  contents: write # so it can comment
  pull-requests: write # so it can create pull requests
  checks: write # so it can create a check run

jobs:
  sync-to-prerelease:
    name: Backport pull request
    runs-on: ubuntu-latest
    # Don't run on closed unmerged pull requests and only PRs to main
    # or on comment made by Github Action Bot
    if: > 
      (
        github.event.pull_request.merged && 
        github.event.pull_request.base.ref == 'main'
      ) || (
        github.event_name == 'issue_comment' &&
        github.event.issue.pull_request &&
        github.event.comment.user.id != 41898282 &&
        startsWith(github.event.comment.body, '/sync-prerelease')
      )
    steps:
      - uses: actions/checkout@v4

      - name: Create backport pull requests
        id: synced-pr
        # https://github.com/korthout/backport-action/releases/tag/v3.0.0
        uses: korthout/backport-action@7e7cb1977d64d20339e8fdec12c0a1a065371de7
        with:
          cherry_picking: auto
          branch_name: sync-${pull_number}-to-${target_branch}
          merge_commits: skip
          pull_title: '[Sync to ${target_branch}] ${pull_title}'
          pull_description: |
            # Description
            Sync of #${pull_number} to `${target_branch}`.

            ## Original PR

            ### ${pull_title}
            ${pull_description}
          # Don't trigger on labels, and always PR to prerelease
          label_pattern: ''
          target_branches: prerelease

      - name: Trigger deploy using a comment
        if: steps.synced-pr.outputs.was_successful == 'true'
        uses: actions/github-script@v7
        with:
          # special fine-grained token for issue comment trigger
          github-token: ${{ secrets.ISSUE_COMMENT_TRIGGER_PAT }}
          script: |
            await github.rest.issues.createComment({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: "${{ steps.synced-pr.outputs.created_pull_numbers }}",
              body: "/deploy-preview",
            });