protected function getConfigFiles()
    {
        $ret = [];
        foreach ($this->getCandidateConfigFiles() as $configFile) {
            if (is_file($configFile)) {
                $ret[]= $configFile;
                break;
            }
        }
        $configFile = join(
            '/',
            [
                $this->getRootDir(),
                'config',
                sprintf('kernel_%s.yml', $this->getName())
            ]
        );
        if (is_file($configFile)) {
            $ret[]= $configFile;
        }
        return $ret;
    }