chore: add test for frontend deploy notif channel

Author: talissoncosta

.github/workflows/test-slack-frontend-deploy.yml

@@ -0,0 +1,50 @@
+name: Test Slack Frontend Deploy
+
+on:
+  workflow_dispatch:
+
+jobs:
+  test-slack:
+    name: Test Slack Notification
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Send smoke test notification
+        env:
+          SLACK_WEBHOOK_URL: ${{ secrets.SLACK_FRONTEND_DEPLOY_WEBHOOK }}
+        run: |
+          curl -sS -X POST \
+            -H 'Content-type: application/json' \
+            --data '{
+              "text": "🧪 Production smoke test required",
+              "blocks": [
+                {
+                  "type": "header",
+                  "text": {
+                    "type": "plain_text",
+                    "text": "🧪 Production smoke test required"
+                  }
+                },
+                {
+                  "type": "section",
+                  "text": {
+                    "type": "mrkdwn",
+                    "text": "The frontend has been successfully deployed to production. Please verify the application directly in production."
+                  }
+                },
+                {
+                  "type": "actions",
+                  "elements": [
+                    {
+                      "type": "button",
+                      "text": {
+                        "type": "plain_text",
+                        "text": "Open Production"
+                      },
+                      "url": "https://app.flagsmith.com"
+                    }
+                  ]
+                }
+              ]
+            }' \
+            "$SLACK_WEBHOOK_URL"