compose an main angepasst

math-tutor/docker/docker-compose.yml

 services:
-  nginx:
-    image: nginx:1.27-alpine
-    depends_on:
-      - backend
-      - frontend
-    ports:
-      - "80:80"
-    volumes:
-      - ./nginx.conf:/etc/nginx/conf.d/default.conf:ro
-      - frontend-dist:/usr/share/nginx/html:ro
-    restart: unless-stopped
-
   backend:
     build:
       context: ../backend
       dockerfile: Dockerfile
     env_file:
-      - ../backend/.env
+      - ../backend/.env_openai
     expose:
       - "8000"
     healthcheck:
@@ -34,6 +22,8 @@ services:
     restart: unless-stopped
     volumes:
       - ./logs:/app/logs
+    networks:
+      - web
 
   frontend:
     build:
@@ -41,9 +31,10 @@ services:
       dockerfile: Dockerfile
     depends_on:
       - backend
-    volumes:
-      - frontend-dist:/dist
     restart: unless-stopped
+    networks:
+      - web
 
-volumes:
-  frontend-dist:
+networks:
+  web:
+    external: true