change port from 3000 to 4000

Dockerfile

@@ -12,5 +12,5 @@ RUN npm install -g nodemon
 # Bundle app source
 COPY . .
 RUN mkdir -p /usr/src/app/db
-EXPOSE 3000
+EXPOSE 4000
 CMD [ "node", "app.js" ]

app.js

@@ -19,7 +19,7 @@ const gameRoutes = gameModule.router;
 const serverRoutes = require('./routes/server');
 const authRoutes = require('./routes/auth');
 
-const port = 3000;
+const port = 4000;
 
 // Serve static files from the 'public' directory
 app.use(express.static('public'));