wordpress-develop/.github/workflows/slack-notifications.yml

##
# Posts messages to the Making WordPress Core Slack Instance by
# submitting data to Slack webhook URLs received by Slack Workflows.
##
name: Slack Notifications

on:
  workflow_run:
    workflows:
      - Code Coverage Report
      - Coding Standards
      - End-to-end Tests
      - JavaScript Tests
      - PHP Compatibility
      - PHPUnit Tests
      - Test NPM
      - Test old branches
    types:
      - completed
    branches:
      - master
      - trunk
      - '[3-9].[0-9]'

jobs:
  # Gathers the details needed for Slack notifications.
  #
  # These details are passed as outputs to the subsequent, dependant jobs that
  # submit data to Slack webhook URLs configured to post messages.
  #
  # Performs the following steps:
  # - Retrieves the previous workflow run and stores its conclusion.
  # - Sets the previous conclusion as an output.
  # - Constructs and stores a message payload as an output.
  prepare:
    name: Prepare notifications
    runs-on: ubuntu-latest
    if: ${{ github.repository == 'WordPress/wordpress-develop' && github.event.workflow_run.event != 'pull_request' }}
    outputs:
      previous_conclusion: ${{ steps.previous-conclusion.outputs.previous_conclusion }}
      payload: ${{ steps.create-payload.outputs.payload }}

    steps:
      - name: Get details about the previous workflow run
        id: previous-result
        uses: actions/github-script@a3e7071a34d7e1f219a8a4de9a5e0a34d1ee1293 # v4.0.2
        with:
          script: |
            const workflow_runs = await github.actions.listWorkflowRuns({
              owner: context.repo.owner,
              repo: context.repo.repo,
              workflow_id: ${{ github.event.workflow_run.workflow_id }},
              branch: '${{ github.event.workflow_run.head_branch }}',
              per_page: 1,
              page: 2,
            });
            return workflow_runs.data.workflow_runs[0].conclusion;            

      - name: Store previous conclusion as an output
        id: previous-conclusion
        run: echo "::set-output name=previous_conclusion::${{ steps.previous-result.outputs.result }}"

      - name: Construct payload and store as an output
        id: create-payload
        run: echo "::set-output name=payload::{\"workflow_name\":\"${{ github.event.workflow_run.name }}\",\"ref_name\":\"${{ github.event.workflow_run.head_branch }}\",\"run_url\":\"${{ github.event.workflow_run.html_url }}\"}"

  # Posts notifications when a workflow fails.
  failure:
    name: Failure notifications
    runs-on: ubuntu-latest
    needs: [ prepare ]
    if: ${{ github.event.workflow_run.conclusion == 'failure' }}

    steps:
      - name: Post failure notifications to Slack
        uses: slackapi/slack-github-action@d5d276d7ae0f38f29322b80da9baf985cc80f8b1 # v1.15.0
        with:
          payload: ${{ needs.prepare.outputs.payload }}
        env:
          SLACK_WEBHOOK_URL: ${{ secrets.SLACK_GHA_FAILURE_WEBHOOK }}

  # Posts notifications the first time a workflow run succeeds after previously failing.
  fixed:
    name: Fixed notifications
    runs-on: ubuntu-latest
    needs: [ prepare ]
    if: ${{ needs.prepare.outputs.previous_conclusion == 'failure' && github.event.workflow_run.conclusion == 'success' }}

    steps:
      - name: Post failure notifications to Slack
        uses: slackapi/slack-github-action@d5d276d7ae0f38f29322b80da9baf985cc80f8b1 # v1.15.0
        with:
          payload: ${{ needs.prepare.outputs.payload }}
        env:
          SLACK_WEBHOOK_URL: ${{ secrets.SLACK_GHA_FIXED_WEBHOOK }}

  # Posts notifications when a workflow is successful.
  success:
    name: Success notifications
    runs-on: ubuntu-latest
    needs: [ prepare ]
    if: ${{ github.event.workflow_run.conclusion == 'success' }}

    steps:
      - name: Post success notifications to Slack
        uses: slackapi/slack-github-action@d5d276d7ae0f38f29322b80da9baf985cc80f8b1 # v1.15.0
        with:
          payload: ${{ needs.prepare.outputs.payload }}
        env:
          SLACK_WEBHOOK_URL: ${{ secrets.SLACK_GHA_SUCCESS_WEBHOOK }}

  # Posts notifications when a workflow is cancelled.
  cancelled:
    name: Cancelled notifications
    runs-on: ubuntu-latest
    needs: [ prepare ]
    if: ${{ github.event.workflow_run.conclusion == 'cancelled' }}

    steps:
      - name: Post cancelled notifications to Slack
        uses: slackapi/slack-github-action@d5d276d7ae0f38f29322b80da9baf985cc80f8b1 # v1.15.0
        with:
          payload: ${{ needs.prepare.outputs.payload }}
        env:
          SLACK_WEBHOOK_URL: ${{ secrets.SLACK_GHA_CANCELLED_WEBHOOK }}