Auto-port to 4.1 workflow (netty/netty)

name: Auto-port to 4.1
on:
  pull_request_target:
    types:
      - closed
      - labeled
    branches:
      - '4.2'
      - '5.0'
 
jobs:
  autoport:
    timeout-minutes: 30
    name: "Auto-porting to 4.1"
    concurrency:
      group: port-41-${{ github.event.pull_request.number }}
      cancel-in-progress: true
    if: github.event.pull_request.merged && contains(github.event.pull_request.labels.*.name, 'needs-cherry-pick-4.1')
    runs-on: latchkey-small
    steps:
      - name: Checkout repository
        uses: actions/checkout@v6
        with:
          ssh-key: ${{ secrets.SSH_PRIVATE_KEY_PEM }}
          ssh-known-hosts: ${{ secrets.SSH_KNOWN_HOSTS }}
          fetch-depth: '0' # Cherry-pick needs full history
 
      - name: Setup git configuration
        run: |
          git config --global user.email "netty-project-bot@users.noreply.github.com"
          git config --global user.name "Netty Project Bot"
 
      - name: Create auto-port PR branch and cherry-pick
        id: cherry-pick
        run: |
          MERGE_COMMIT="${{ github.event.pull_request.merge_commit_sha }}"
          echo "Auto-porting commit: $MERGE_COMMIT"
          
          PORT_BRANCH="auto-port-pr-${{ github.event.pull_request.number }}-to-4.1"
          if [[ $(git branch --show-current) != '4.1' ]]; then
            git fetch origin 4.1:4.1
          fi
          git checkout -b "$PORT_BRANCH" 4.1
          
          if git cherry-pick -x "$MERGE_COMMIT"; then
            echo "Cherry-pick successful"
          else
            echo "Cherry-pick failed - conflicts detected"
            git cherry-pick --abort
            exit 1
          fi
          echo "branch=$PORT_BRANCH" >> "$GITHUB_OUTPUT"
 
      - name: Push auto-port branch
        id: push
        if: steps.cherry-pick.outcome == 'success'
        run: |
          if ! git push origin "${{ steps.cherry-pick.outputs.branch }}"; then
            echo "Auto-port branch push failed"
            exit 1
          fi
          
      - name: Create pull request
        id: create-pr
        if: steps.cherry-pick.outcome == 'success'
        uses: actions/github-script@v8
        with:
          github-token: '${{ secrets.PAT_TOKEN_READ_WRITE_PR }}'
          script: |
            const { data: pr } = await github.rest.pulls.create({
              owner: context.repo.owner,
              repo: context.repo.repo,
              title: `Auto-port 4.1: ${context.payload.pull_request.title}`,
              head: '${{ steps.cherry-pick.outputs.branch }}',
              base: '4.1',
              body: `Auto-port of #${context.payload.pull_request.number} to 4.1\n` +
                    `Cherry-picked commit: ${context.payload.pull_request.merge_commit_sha}\n\n---\n` +
                    `${context.payload.pull_request.body || ''}`
            });
            console.log(`Created auto-port PR: ${pr.html_url}`);
            await github.rest.issues.createComment({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: context.payload.pull_request.number,
              body: `Auto-port PR for 4.1: #${pr.number}`
            });
 
      # Important: This script MUST run with the default GITHUB_TOKEN to avoid triggering other actions.
      - name: Remove triggering label
        if: steps.create-pr.outcome == 'success'
        uses: actions/github-script@v8
        with:
          script: |
            await github.rest.issues.removeLabel({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: context.payload.pull_request.number,
              name: 'needs-cherry-pick-4.1'
            });
 
      - name: Report cherry-pick conflicts
        if: failure() && steps.cherry-pick.outcome == 'failure'
        uses: actions/github-script@v8
        with:
          github-token: '${{ secrets.PAT_TOKEN_READ_WRITE_PR }}'
          script: |
            await github.rest.issues.createComment({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: context.payload.pull_request.number,
              body: `Could not create auto-port PR.\nGot conflicts when cherry-picking onto 4.1.`
            });
 
      - name: Report auto-port branch push failure
        if: failure() && steps.push.outcome == 'failure'
        uses: actions/github-script@v8
        with:
          github-token: '${{ secrets.PAT_TOKEN_READ_WRITE_PR }}'
          script: |
            await github.rest.issues.createComment({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: context.payload.pull_request.number,
              body: `Could not create auto-port PR.\n`+
                    `I could cherry-pick onto 4.1 just fine, but pushing the new branch failed.`
            });
 
      - name: Remove branch on PR create failure
        if: failure() && steps.cherry-pick.outputs.branch
        run: |
          git push -d origin "${{ steps.cherry-pick.outputs.branch }}"