Fixed dockerfile

frontend/nginx.conf

@@ -7,7 +7,7 @@ server {
 
   # API wird intern an Express weitergereicht
   location ^~ /api/ {
-    proxy_pass http://backend:3000/;
+    proxy_pass http://schiri-backend:3000/;
     proxy_http_version 1.1;
     proxy_set_header Upgrade $http_upgrade;
     proxy_set_header Connection keep-alive;