fix: fixes compose file

docker-compose.yml

@@ -1,9 +1,11 @@
 services:
   backend:
-    build: .
+    build:
+      context: ./backend
+      dockerfile: Dockerfile
     container_name: family-budget-backend
     env_file:
-      - file.env
+      - ./backend/.env
     ports:
       - "3000:3000"
     restart: unless-stopped