Setup slack notifications for cron jobs (#410)

* DEV : Setup slack notifications for cron jobs

	modified:   .github/workflows/weekly-scheduled-tests.yml

* DEV : Use a single notification for both cron jobs

Earlier, we used separate slack notifications for each of the two cron
jobs in this repository. With this commit, we simply use a single slack
notification to indicate job failure on either cron jobs.

	modified:   .github/workflows/weekly-scheduled-tests.yml

.github/workflows/weekly-scheduled-tests.yml

@@ -34,7 +34,6 @@ jobs:
         cd testdir
         python -X faulthandler -m unittest discover -v traits_futures
 
-
   test-bleeding-edge:
     strategy:
       matrix:
@@ -72,3 +71,31 @@ jobs:
       with:
         working-directory: ${{ runner.temp }}
         run: python -X faulthandler -m unittest discover -v traits_futures
+
+  notify-on-failure:
+    needs: [test-all-platform-python-combinations, test-bleeding-edge]
+    if: failure()
+    runs-on: ubuntu-latest
+    steps:
+      - name: Notify Slack channel on failure
+        uses: voxmedia/github-action-slack-notify-build@v1
+        with:
+          channel_id: ${{ secrets.ETS_BOTS_SLACK_CHANNEL_ID }}
+          status: FAILED
+          color: danger
+        env:
+          SLACK_BOT_TOKEN: ${{ secrets.SLACK_ACTION_SECRET }}
+
+  notify-on-success:
+    needs: [test-all-platform-python-combinations, test-bleeding-edge]
+    if: success()
+    runs-on: ubuntu-latest
+    steps:
+      - name: Notify Slack channel on success
+        uses: voxmedia/github-action-slack-notify-build@v1
+        with:
+          channel_id: ${{ secrets.ETS_BOTS_SLACK_CHANNEL_ID }}
+          status: SUCCESS
+          color: good
+        env:
+          SLACK_BOT_TOKEN: ${{ secrets.SLACK_ACTION_SECRET }}