public function getConfigTreeBuilder()
{
$treeBuilder = new TreeBuilder();
$rootNode = $treeBuilder->root('updater');
$rootNode->addDefaultsIfNotSet()->children()->enumNode('type')->values(['all', 'db_only'])->defaultValue('all')->end()->arrayNode('extensions')->prototype('scalar')->end()->defaultValue([])->end()->end();
return $treeBuilder;
}