fix: allow nginx to start without graphiql

Author: Naramsim

Resources/nginx/nginx.conf

@@ -47,10 +47,6 @@ http {
         server graphql-engine:8080 fail_timeout=0;
     }
 
-    upstream graphiql_upstream {
-        server graphiql:80 fail_timeout=0;
-    }
-
     geo $limit {
         default 1;
         10.0.0.0/8 0;
@@ -109,7 +105,8 @@ http {
             proxy_set_header X-Real-IP $remote_addr;
             proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
             proxy_set_header Host $http_host;
-            proxy_pass http://graphiql_upstream/;
+            set $upstream_graphiql graphiql_upstream;
+            proxy_pass http://$upstream_graphiql/;
         }
 
         location /graphql/v1beta {