Update Dockerfile

Dockerfile

@@ -11,7 +11,7 @@ COPY . /app
 RUN if id "user" >/dev/null 2>&1; then \
       echo "User 'user' already exists."; \
     else \
-      useradd -m -u user; \
+      useradd -m user; \
     fi
 
 # Set appropriate permissions for the application directory