SCANPY-188 Enable slack notifications for build failure (#206)

Author: Wohops

.github/workflows/SlackNotify.yml

@@ -0,0 +1,22 @@
+---
+name: Slack Notifications
+on:
+  check_suite:
+    types: [completed]
+
+permissions:
+  contents: read
+  id-token: write
+  checks: read
+jobs:
+  notify:
+    if: >-
+      contains(fromJSON('["main", "master"]'), github.event.check_suite.head_branch) || startsWith(github.event.check_suite.head_branch, 'dogfood-') || startsWith(github.event.check_suite.head_branch, 'branch-')
+    runs-on: ubuntu-latest
+    steps:
+      - name: Send Slack Notification
+        env:
+          GITHUB_TOKEN: ${{ github.token }}
+        uses: SonarSource/[email protected]
+        with:
+          slackChannel: squad-python