feat(CI-SLACK): add slack notification if tests crash

.github/slack/failed.json

@@ -0,0 +1,30 @@
+{
+  "channel": "${SLACK_CHANNEL}",
+  "blocks": [
+    {
+      "type": "section",
+      "text": {
+        "type": "mrkdwn",
+        "text": ":red_circle: *${GITHUB_WORKFLOW} failed*"
+      }
+    },
+
+    {
+      "type": "context",
+      "elements": [
+        {
+          "type": "mrkdwn",
+          "text": "*Started by:* ${GITHUB_ACTOR}"
+        },
+        {
+          "type": "mrkdwn",
+          "text": "*Commit:* ${GITHUB_REF} @ ${GITHUB_SHA}"
+        },
+        {
+          "type": "mrkdwn",
+          "text": "*Details at:* ${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY}/actions/runs/${GITHUB_RUN_ID}"
+        }
+      ]
+    }
+  ]
+}

.github/workflows/testOnPush.yml

@@ -3,7 +3,7 @@ name: Test on Push
 on: [push]
 
 jobs:
-  build:
+  test:
     runs-on: ubuntu-latest
 
     steps:
@@ -21,3 +21,25 @@ jobs:
 
     - name: Run test
       run: make ci-test
+
+  notify:
+    name: Notify Slack on failure
+    needs: [test]
+    if: ${{ failure() }}
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v2
+
+    - name: envsubst
+      uses: mshick/fast-envsubst@v1
+      with:
+        in-file: .github/slack/failed.json
+        out-file: payload.json
+
+    - name: Send slack message
+      env:
+        TOKEN: ${{ secrets.SLACK_TOKEN }}
+      run: |
+        curl -H "Authorization: Bearer $TOKEN" -H "Content-type: application/json" -d @payload.json -XPOST https://slack.com/api/chat.postMessage