Rolling Updates: Implement readiness probe for backend deployment

The rollout is too fast to observe, let's slow it down a bit

Author: kierenevans

rolling-updates/start/backend-deployment.yaml

@@ -17,3 +17,9 @@ spec:
       containers:
       - image: ghcr.io/eficode-academy/quotes-flask-backend:release
         name: quotes-flask-backend
+        readinessProbe:
+          exec:
+            command:
+              - /bin/true
+            initialDelaySeconds: 10
+            periodSeconds: 10