name: Stable branch auto merge

on:
  push:
    branches: [ stable ]

jobs:
  merge:
    runs-on: ubuntu-latest
    steps:
      # First: merge
      - uses: octokit/request-action@v2.x
        id: merge_action
        with:
          route: POST /repos/:repository/merges
          repository: ${{ github.repository }}
          base: master
          head: stable
        env:
          GITHUB_TOKEN: ${{ secrets.STABLE_MERGE_GITHUB_TOKEN }}
      # Report errors if any
      - uses: rtCamp/action-slack-notify@v2.0.2
        id: error_message_slack
        name: Slack notification
        if: ((steps.merge_action.outputs.status != 201) && (steps.merge_action.outputs.status != 204)) || failure()
        env:
          SLACK_WEBHOOK: ${{ secrets.SLACK_WEBHOOK }}
          SLACK_CHANNEL: "cke5-ci"
          SLACK_ICON: https://github.com/ckeditor.png?size=48
          SLACK_USERNAME: "stable auto merge action"
          SLACK_MESSAGE: ${{ format('💥 Error, merge call returned code {0}, see {1} for a list of codes with explanation. 💥', steps.merge_action.outputs.status, 'https://developer.github.com/v3/repos/merging/#perform-a-merge' ) }}