notify_comments.yml

# This is a basic workflow to help you get started with Actions

name: Notify Comments on Issues

# Controls when the workflow will run
on:
  # Triggers the workflow on comment events on pending response issues
  issue_comment:
    types: [created]

# A workflow run is made up of one or more jobs that can run sequentially or in parallel
jobs:
  # This workflow contains a single job called "notify"
  notify:
    # The type of runner that the job will run on
    runs-on: ubuntu-latest

    # Steps represent a sequence of tasks that will be executed as part of the job
    steps:
      # Runs a single command using the runners shell
      - name: Run webhook curl command
        env:
          WEBHOOK_URL: ${{ secrets.SLACK_COMMENT_WEBHOOK_URL }}
          BODY: ${{ toJson(github.event.comment.body) }}
          HTML_URL: ${{github.event.comment.html_url}}
        shell: bash
        run: echo "$BODY" | xargs -I {} curl -s POST "$WEBHOOK_URL" -H "Content-Type:application/json" --data '{"issue":"'"$HTML_URL"'", "body":"{}"}'