fixup! настройка докер-связи с бэком

nginx/default.conf.template

@@ -2,7 +2,7 @@ server {
     listen 80;
 
     location /api/ {
-        proxy_pass https://${BACKEND_UPSTREAM};
+        proxy_pass https://${BACKEND_UPSTREAM}/;
         proxy_http_version 1.1;
         proxy_set_header Host $host;
         proxy_set_header X-Real-IP $remote_addr;