compose: Add gzip to compose nginx config

compose/etc/nginx.conf

@@ -45,6 +45,10 @@ http {
             # docker container gets only a single HTTP request
             proxy_cache_use_stale updating;
             proxy_cache_lock on;
+
+            gzip on;
+            gzip_proxied any;
+            gzip_types application/json application/javascript text/css;
         }
     }
 }