Using PORT as env in workbench app (#168)

This PR addresses #167 

Update server configuration to use 'localhost' as the host and
dynamically assign the port number

workbench-app/vite.config.ts

@@ -28,7 +28,7 @@ export default defineConfig({
     server: {
         https: true,
         host: '127.0.0.1',
-        port: 4000,
+        port: JSON.parse(process.env.PORT || '4000'),
     },
     build: {
         outDir: 'build',