code: public function getConfigTreeBuilder()
      {
          $treeBuilder = new TreeBuilder();
          $rootNode = $treeBuilder->root('yucca');
  
          // Here you should define the parameters that are allowed to
          // configure your bundle. See the documentation linked above for
          // more information on that topic.
          $this->addConnections($rootNode);
          $this->addSchema($rootNode);
          $this->addSources($rootNode);
          $this->addMapping($rootNode);
          $this->addSelectors($rootNode);
  
          return $treeBuilder;
      }
docs: {@inheritDoc}