Laravelポリシーで管理者を設定する方法

<?php

use Illuminate\Support\Facades\Facade;

return [

     'admin' => [
          '1',
     ],

php artisan make:policy UserPolicy

//sail
sail artisan make:policy UserPolicy

protected $policies = [
User::class => UserPolicy::class,
];

<?php

namespace App\Policies;

use App\Models\User;
use Illuminate\Auth\Access\HandlesAuthorization;

class UserPolicy
{
     use HandlesAuthorization;

     public function isAdmin(User $user) {
          $admin = config('app.admin');
          return in_array($user->id, $admin);
     }

     public function before(User $user, $ability) {
          if ($this->isAdmin($user)) {
               return true;
          }
     }
}