Add slack notification

Author: NiklasMerz

.github/workflows/summary-release.yml

@@ -41,4 +41,12 @@ jobs:
         upload_url: ${{ steps.create_release.outputs.upload_url }} # This pulls from the CREATE RELEASE step above, referencing it's ID to get its outputs object, which include a `upload_url`. See this blog post for more info: https://jasonet.co/posts/new-features-of-github-actions/#passing-data-to-future-steps 
         asset_path: ./monthly-summary-$.zip
         asset_name: monthly-summary-${{ steps.current-time.outputs.time }}.zip
-        asset_content_type: application/zip
+        asset_content_type: application/zip
+    - name: Report Status
+      if: always()
+      uses: ravsamhq/notify-slack-action@master
+      with:
+        status: ${{ job.status }}
+        notify_when: 'failure'
+      env:
+        SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK }}