notify-on-fail.yml

---
name: Notify if build fails

on:
  workflow_run:
    workflows:
      - "Build"
    branches:
      - main
      - master
    types:
      - completed

jobs:
  on-failure:
    runs-on: ubuntu-latest
    env:
      notification_receiver_mail:   ${{ secrets.NOTIFICATION_RECEIVER_MAIL   }}
      notification_sender_username: ${{ secrets.NOTIFICATION_SENDER_USERNAME }}
      notification_sender_password: ${{ secrets.NOTIFICATION_SENDER_PASSWORD }}
    if: ${{ github.event.workflow_run.conclusion == 'failure' }}
    steps:
      - name: Send mail
        uses: dawidd6/action-send-mail@v3
        if: ${{ env.notification_receiver_mail != '' }}
        with:
          server_address: smtp.gmail.com
          server_port: 465

          username: ${{ env.notification_sender_username }}
          password: ${{ env.notification_sender_password }}
          from: Github Actions Bot

          to: ${{ env.notification_receiver_mail }}

          subject: '[${{ github.repository }}] Github Actions job has failed'
          body: Build job of ${{ github.repository }} has failed,
                see https://github.com/${{github.repository}}/actions