Update Dockerfile

Dockerfile

@@ -8,7 +8,7 @@
 FROM cirrusci/flutter:latest AS flutter-builder
 
 # Define an ARG for the WS_SERVER_URL
-ARG WS_SERVER_URL=ws://localhost:7860
+ARG WS_SERVER_URL=ws://localhost:3000
 ENV WS_SERVER_URL=${WS_SERVER_URL}
 
 WORKDIR /client
@@ -37,8 +37,8 @@ RUN npm run build
 # Start server
 FROM node:20-bullseye-slim
 
-ENV PORT=7860
-# EXPOSE 3000
+ENV PORT=3000
+EXPOSE 3000
 ENV NODE_ENV=production
 
 WORKDIR /server