feat: add PORT env to express templates

templates/types/simple/express/index.ts

+/* eslint-disable turbo/no-undeclared-env-vars */
 import cors from "cors";
 import "dotenv/config";
 import express, { Express, Request, Response } from "express";
 import chatRouter from "./src/routes/chat.route";
 
 const app: Express = express();
-const port = 8000;
+const port = parseInt(process.env.PORT || "8000");
 
 const env = process.env["NODE_ENV"];
 const isDevelopment = !env || env === "development";

templates/types/streaming/express/index.ts

+/* eslint-disable turbo/no-undeclared-env-vars */
 import cors from "cors";
 import "dotenv/config";
 import express, { Express, Request, Response } from "express";
 import chatRouter from "./src/routes/chat.route";
 
 const app: Express = express();
-const port = 8000;
+const port = parseInt(process.env.PORT || "8000");
 
 const env = process.env["NODE_ENV"];
 const isDevelopment = !env || env === "development";