fix: added buffers for nginx upstreams

infrastructure/nginx/nginx.conf

@@ -75,30 +75,37 @@ http {
     server_tokens off;
 
     upstream frontend {
+        zone frontend 64k;
         server frontend:80 resolve;
     }
 
     upstream backend {
+        zone backend 64k;
         server backend:8080 resolve;
     }
 
     upstream backend-staticfiles {
+        zone backend-staticfiles 64k;
         server backend-staticfiles:80 resolve;
     }
 
     upstream docs {
+        zone docs 64k;
         server docs:80 resolve;
     }
 
     upstream grafana {
+        zone grafana 64k;
         server grafana:3000 resolve;
     }
 
     upstream minio {
+        zone minio 64k;
         server minio:9000 resolve;
     }
 
     upstream minio-ui {
+        zone minio-ui 64k;
         server minio:9001 resolve;
     }