feat: add notify workflow

Author: christianncode

.github/workflows/notify.yml

@@ -0,0 +1,12 @@
+name: Notify with Slack
+on: push
+jobs:
+  notify:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Send GitHub Action data to a Slack workflow
+        uses: slackapi/slack-github-action@v2.1.1
+        with:
+          payload-delimiter: "_"
+          webhook: ${{ secrets.SLACK_WEBHOOK_URL }}
+          webhook-type: webhook-trigger