set up demo mode

docker-compose.yaml

@@ -1,6 +1,6 @@
 services:
   db:
-    container_name: recipes_postgres
+    container_name: recipes_postgres_${ID}
     image: docker.io/library/postgres:17
     # restart: always
     env_file:
@@ -15,13 +15,13 @@ services:
       - ./postgres/db:/var/lib/postgresql/data
   backend:
     image: recipes_backend
-    container_name: recipes_backend
+    container_name: recipes_backend_${ID}
     build:
       context: ./backend
       args:
         NODE_ENV: ${NODE_ENV}
     ports:
-      - "3000:3000"
+      - "${BACKEND_PORT}:3000"
     volumes:
       - ./backend:/usr/src/app
     environment:
@@ -31,13 +31,13 @@ services:
       - DB_NAME=${DB_NAME}
   frontend:
     image: recipes_frontend
-    container_name: recipes_frontend
+    container_name: recipes_frontend_${ID}
     build:
       context: ./backend
       args:
         NODE_ENV: ${NODE_ENV}
     ports:
-      - "8081:80"
+      - "${FRONTEND_PORT}:80"
     volumes:
       - ./frontend:/usr/src/app
     environment: