check-merge.yml

name: check-pr-merge
on:
  pull_request:
    types:
      - opened
      - synchronize
      - reopened
    branches:
      - master
      - "release/*"
jobs:
  check-merge:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v4
        with:
          fetch-depth: 0
      - name: Check if branch is up to date
        env:
          BASE_REF: ${{ github.base_ref }}
        run: |
          baseRef="origin/${BASE_REF}"
          echo "Targeting '$baseRef'"
          
          git fetch origin
          
          res=$(git --no-pager log HEAD..$baseRef --oneline)
          if [[ -z "$res" ]]; then
            echo "Branch is up to date with master"
          else
            echo "Branch is not up to date with master"
            echo "Please rebase your branch"
            echo "$res"
            exit 1
          fi