public function getSharedFileMounts(array $appConfig)
    {
        $sharedFileMounts = [];
        if (!empty($appConfig['mounts'])) {
            foreach ($this->normalizeMounts($appConfig['mounts']) as $path => $definition) {
                if (isset($definition['source_path'])) {
                    $sharedFileMounts[$path] = $definition['source_path'] ?: 'files';
                }
            }
        }

        return $sharedFileMounts;
    }