ci(build): added in dotenvx for env stuff

backend/app.ts

@@ -1,13 +1,14 @@
 import express from "express";
 import { setupRoutes } from "@/src/routes/routeHandler.route.js";
 
+const port = Number(process.env.PORT);
 const startApp = async () => {
 	const app = express();
 	const baseUrl = "";
 	setupRoutes(baseUrl, app);
 
-	app.listen(3000, () => {
-		console.log("Listening on port 3000");
+	app.listen(port, () => {
+		console.log(`Listening on port ${port}`);
 	});
 };