Added healthcheck for leaderboard backend

Added an additional healthcheck to verify the health of the leaderboard backend service running on port 5000

apps/annugame/healthcheck.yaml

@@ -16,4 +16,23 @@ spec:
   targetRef:
     group: ""
     kind: Service
-    name: annugame
+    name: annugame
+---
+apiVersion: networking.gke.io/v1
+kind: HealthCheckPolicy
+metadata:
+  namespace: default
+  name: annugame-leaderboard
+spec:
+  default:
+    config:
+      type: HTTP
+      httpHealthCheck:
+        port: 5000
+        requestPath: /
+    logConfig:
+      enabled: true
+  targetRef:
+    group: ""
+    kind: Service
+    name: annugame