code: public function getExtensionConfig($extensionName, array $extensionConfigs, PluginContainerBuilder $container): array
      {
          switch ($extensionName) {
              case 'contao':
                  return $this->handlePrependLocale($extensionConfigs, $container);
  
              case 'doctrine':
                  return $this->addDefaultServerVersion($extensionConfigs, $container);
  
              default:
                  return $extensionConfigs;
          }
      }
docs: {@inheritdoc}