Track class for changes to rebuilt container

AppBundle.php

<?php

use Symfony\Component\DependencyInjection\ContainerBuilder;
use Symfony\Component\HttpKernel\Bundle\Bundle;

class AppBundle extends Bundle
{
    public function build(ContainerBuilder $container)
    {
        // Any changes to the MyConfig class will trigger the container cache to be rebuilt
        // Note: This only works when Symfony is in development mode
        $container->addObjectResource(MyConfig::class);
    }
}