Update Dockerfile

Dockerfile

@@ -14,6 +14,6 @@ RUN npm run build
 # Set the env to "production"
 ENV NODE_ENV production
 # Expose the port on which the app will be running (3000 is the default that `serve` uses)
-EXPOSE 7860
+EXPOSE 3000
 # Start the app
 CMD [ "npx", "serve", "-l", "7860", "build" ]