Notify slack on scheduled test failure (#221)

* Notify slack on scheduled test failure (#60)

* Fixed cherry pick results

.github/workflows/test_and_deploy.yml

@@ -61,6 +61,15 @@ jobs:
           secret-codecov-token: ${{ secrets.CODECOV_TOKEN }}
           use-xvfb: true
 
+      - name: Notify slack on scheduled failure
+        if: failure() && github.event_name == 'schedule'
+        uses: ravsamhq/notify-slack-action@v2
+        with:
+          status: ${{ job.status }} # required
+          notify_when: 'failure'
+        env:
+          SLACK_WEBHOOK_URL: ${{ secrets.SLACK_NOTIFYBOT_WEBHOOK_URL }} # required
+
   test-with-conda:
     # mainly checks conda installation of niftyreg, especially key on Silicon macs
     needs: [linting, manifest]