kubernetes: use /healthz endpoint for livenessProbe

kubernetes/backend-go-deployment.yaml

@@ -56,12 +56,12 @@ spec:
               key: password
         - name: AMQP_URL
           value: amqp://$(RABBITMQ_USERNAME):$(RABBITMQ_PASSWORD)@broker/%2F
-        # livenessProbe:
-        #   httpGet:
-        #     path: /api/v2
-        #     port: 4000
-        #   initialDelaySeconds: 3
-        #   periodSeconds: 3
+        livenessProbe:
+          httpGet:
+            path: /healthz
+            port: 4000
+          initialDelaySeconds: 3
+          periodSeconds: 3
         ports:
         - name: http
           containerPort: 4000