pr_description.yml

name: Check Pull Request Description

on:
  pull_request:
    # synchronize is not technically needed, but 
    types: [opened, edited, synchronize]

jobs:
  changelog:
    runs-on: ubuntu-latest

    steps:
      - run: |
          body=$(jq -r <<< '${{ toJson(github.event.pull_request.body) }}')
          if [[ -z $(grep -oP 'changelog: *\K\S+' <<< "$body") ]]; then
            echo '::error title=Test::Please write a short comment explaining your change (or "none" for internal only changes)'
            exit 1
          fi

#             echo '::error title=Pull Request body is missing `changelog: ...`::Please write a short comment explaining your change (or "none" for internal only changes)'