Send slack notification on failed GHA jobs (#346)

* Add slack notification to postmerge task failures

* test if conditional

* remove debug messages

.github/workflows/packages.yaml

@@ -11,6 +11,10 @@ on:
   pull_request:
     branches: [main]
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
   build-pypi:
     name: Build PyPI Package

.github/workflows/postmerge-cpu.yml

@@ -58,3 +58,21 @@ jobs:
         with:
           name: pr
           path: pr/
+
+      # If failures occur, notify in slack.
+      - name: Notify Failure in Slack
+        id: slack
+        uses: slackapi/[email protected]
+        if: ${{ failure() && github.ref == 'refs/heads/main' }}
+        with:
+          # This data can be any valid JSON from a previous step in the GitHub Action
+          payload: |
+            {
+              "message": "GitHub Action job failure on github.ref `${{ github.ref }}`",
+              "pull_request": "${{ github.event.pull_request.html_url || github.event.head_commit.url }}",
+              "workflow": "${{ github.workflow }}",
+              "logs_url": "${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}"
+            }
+        env:
+          PR_NUMBER: ${{ github.event.number }}
+          SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK_URL }}

.github/workflows/postmerge-gpu.yml

@@ -25,3 +25,21 @@ jobs:
             branch=${raw/origin\/}
           fi
           cd ${{ github.workspace }}; tox -e test-gpu-postmerge -- $branch
+
+      # If failures occur, notify in slack.
+      - name: Notify Failure in Slack
+        id: slack
+        uses: slackapi/[email protected]
+        if: ${{ failure() && github.ref == 'refs/heads/main' }}
+        with:
+          # This data can be any valid JSON from a previous step in the GitHub Action
+          payload: |
+            {
+              "message": "GitHub Action job failure on github.ref `${{ github.ref }}`",
+              "pull_request": "${{ github.event.pull_request.html_url || github.event.head_commit.url }}",
+              "workflow": "${{ github.workflow }}",
+              "logs_url": "${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}"
+            }
+        env:
+          PR_NUMBER: ${{ github.event.number }}
+          SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK_URL }}