koel/app/Providers/MediaCacheServiceProvider.php

<?php

namespace App\Providers;

use App\Services\MediaCacheService;
use Illuminate\Support\ServiceProvider;

class MediaCacheServiceProvider extends ServiceProvider
{
    public function register(): void
    {
        app()->singleton('MediaCache', static fn (): MediaCacheService => app(MediaCacheService::class));
    }
}