Use env vars

vite.config.ts

@@ -14,6 +14,7 @@ import react from '@vitejs/plugin-react-swc';
 import viteTsconfigPaths from 'vite-tsconfig-paths';
 import legacy from '@vitejs/plugin-legacy';
 import { nodePolyfills } from 'vite-plugin-node-polyfills';
+import 'dotenv/config';
 
 // eslint-disable-next-line import/no-default-export
 export default defineConfig(() => ({
@@ -21,7 +22,8 @@ export default defineConfig(() => ({
         outDir: 'build',
     },
     server: {
-        port: 3000,
+        port: Number(process.env.PORT),
+        allowedHosts: process.env.ALLOWED_HOSTS.split(','),
     },
     resolve: {
         alias: {