/**
  * Helper method to execute a drush command via docker.
  *
  * @param $command
  *      The full drush command.
  */
 private function runDrush($command, VirtualHost $vhost)
 {
     $this->run(sprintf('docker run --rm -it ' . '--volumes-from filesystem%s ' . '-w %s/%s/%s ' . '--link db%s:db ' . 'drush/drush %s', $this->serverSuffix, self::DOCKER_PROJECT_PATH, $this->gitBranch, $vhost->getDocumentRoot(), $this->serverSuffix, $command));
 }