fixed backend issue

docker-compose.yml

@@ -14,6 +14,8 @@ services:
       - ADMIN_TOKEN=${ADMIN_TOKEN:-default_insecure_token}
       - DATA_DIR=/app/data
     restart: unless-stopped
+    networks:
+      - internal_net
 
   frontend:
     build:
@@ -26,3 +28,9 @@ services:
     depends_on:
       - backend
     restart: unless-stopped
+    networks:
+      - internal_net
+
+networks:
+  internal_net:
+    driver: bridge