Serve gateway mjs files as JavaScript

deploy/templates/gateway/nginx.conf

@@ -3,6 +3,9 @@ events { worker_connections 1024; }
 
 http {
     include /etc/nginx/mime.types;
+    types {
+        application/javascript mjs;
+    }
     
     # 인스턴스별로 계산된 포트 주입
     upstream backend_srv {