Add Slack alerts for failures on CI workflows (#793)

Part of https://www.notion.so/Alerting-for-failing-CI-jobs-d0183b65453947aeab11dbddf989d9c0

Reviewed-on: cerc-io/stack-orchestrator#793
Co-authored-by: Prathamesh Musale <prathamesh.musale0@gmail.com>
Co-committed-by: Prathamesh Musale <prathamesh.musale0@gmail.com>

.gitea/workflows/test.yml

@@ -47,5 +47,19 @@ jobs:
           sleep 5
       - name: "Run smoke tests"
         run: ./tests/smoke-test/run-smoke-test.sh
-
-
+      - name: Notify Vulcanize Slack on CI failure
+        if: always()
+        uses: ravsamhq/notify-slack-action@v2
+        with:
+          status: ${{ job.status }}
+          notify_when: 'failure'
+        env:
+          SLACK_WEBHOOK_URL: ${{ secrets.VULCANIZE_SLACK_CI_ALERTS }}
+      - name: Notify DeepStack Slack on CI failure
+        if: always()
+        uses: ravsamhq/notify-slack-action@v2
+        with:
+          status: ${{ job.status }}
+          notify_when: 'failure'
+        env:
+          SLACK_WEBHOOK_URL: ${{ secrets.DEEPSTACK_SLACK_CI_ALERTS }}