php-qml/framework/skeleton/symfony/src/Kernel.php

<?php

declare(strict_types=1);

namespace App;

use Symfony\Bundle\FrameworkBundle\Kernel\MicroKernelTrait;
use Symfony\Component\HttpKernel\Kernel as BaseKernel;

final class Kernel extends BaseKernel
{
    use MicroKernelTrait;

    // The bundled-mode supervisor sets APP_CACHE_DIR / APP_LOG_DIR to writable
    // paths under the user data dir; the AppImage mount is read-only.
    public function getCacheDir(): string
    {
        return $_SERVER['APP_CACHE_DIR'] ?? parent::getCacheDir();
    }

    public function getLogDir(): string
    {
        return $_SERVER['APP_LOG_DIR'] ?? parent::getLogDir();
    }
}