Add configuration for CoreDNS and update host variables for lab environment

terraform/modules/apps/nginx-reverse-proxy/resources/nginx/nginx.conf

@@ -3,7 +3,6 @@ worker_processes  auto;
 error_log  /var/log/nginx/error.log notice;
 pid        /tmp/nginx.pid;
 
-
 events {
     worker_connections  1024;
 }
@@ -32,5 +31,15 @@ http {
 
     keepalive_timeout  65;
 
+    server {
+        listen       8888;
+        server_name  _;
+        location /health {
+            access_log off;
+            return 200 "OK";
+        }
+    }
+
     include /etc/nginx/conf.d/*.conf;
-}
+}
+