fix: build Vite assets in entrypoint for production (APP_ENV=production)

Eliminates dependency on node dev server for live site. Assets served
as static files from public/build/ instead of proxied through Vite.

build/entrypoint.sh

@@ -12,9 +12,15 @@ if [ -n "$WWWGROUP" ] && [ "$WWWGROUP" != "0" ]; then
 fi
 
 composer install --no-interaction
+npm install
 mkdir -p storage/logs storage/framework/views storage/framework/cache storage/framework/sessions
 chown -R www-data:www-data storage bootstrap/cache
 chmod -R 775 storage bootstrap/cache
+
+if [ "$APP_ENV" = "production" ] || [ "$APP_ENV" = "prod" ]; then
+    npm run build
+fi
+
 php artisan migrate --force
 
 exec "$@"