Use localhost resolver to get host

Signed-off-by: Ajay Tripathy <ajay@kubecost.com>

ui/default.nginx.conf

@@ -58,6 +58,7 @@ server {
     add_header ETag "1.96.0";
     listen 9090;
     listen [::]:9090;
+    resolver 127.0.0.1 valid=5s;
     location /healthz {
         return 200 'OK';
     }