CI-on-failure.yml

name: Slack notification on CI failure

on:
  workflow_run:
    workflows: ["CI"]
    branches: ["master", "develop"]
    types:
      - completed

jobs:
  slack-on-failure:
    runs-on: ubuntu-20.04
    if: ${{ github.event.workflow_run.conclusion == 'failure' }}
    steps:
      - name: Post about CI failure to a Slack channel
        id: slack
        uses: slackapi/slack-github-action@v1.23.0
        with:
          # Slack channel id, channel name, or user id to post message.
          # See also: https://api.slack.com/methods/chat.postMessage#channels
          channel-id: ${{ secrets.SLACK_CHANNEL_ID }}
          # For posting a rich message using Block Kit
          payload: |
            {
              "text": "GitHub Action ${{ github.event.workflow_run.name }} result: failure\n${{ github.event.workflow_run.html_url || github.event.workflow_run.url }}"
            }
        env:
          SLACK_BOT_TOKEN: ${{ secrets.SLACK_BOT_TOKEN }}