fix(k8s): Add nginx route for load-balancer health checks

infra/kubernetes/https-lb/ingress.yaml

@@ -18,6 +18,7 @@ spec:
     - host: oslo.pub
       http:
         paths:
-          - backend:
+          - path: /
+            backend:
               serviceName: nginx
-              servicePort: 80
+              servicePort: 6756

infra/kubernetes/nginx/nginx.conf

@@ -25,6 +25,13 @@ http {
     sendfile        on;
     keepalive_timeout  65;
 
+    server {
+        listen 80 default_server;
+        location / {
+            return 200 "ok";
+        }
+    }
+
     server {
         listen       80;
         server_name  oslo.pub;

infra/kubernetes/nginx/nginx.yaml

@@ -51,5 +51,5 @@ spec:
     app: nginx
   ports:
     - protocol: TCP
-      port: 80
+      port: 6756
       targetPort: 80