DBUtilのシングルトン登録

app/Providers/AppServiceProvider.php

@@ -21,6 +21,9 @@ class AppServiceProvider extends ServiceProvider
      */
     public function boot(): void
     {
+        // DB
+        $this->app->singleton(\App\Util\DBUtil::class);
+
         // コンテキスト設定
         $this->app->singleton(\App\Contexts\Model\Shop::class);
         $this->app->singleton(\App\Contexts\Model\Deposit::class);