code: func (p configProvider) ConfigFor(pluginName string) (io.Reader, error) {
  	// there is no config, so there is no potential config
  	if p.config == nil {
  		return nil, nil
  	}
  	// look for matching plugin and get configuration
  	for _, pluginCfg := range p.config.Plugins {
  		if pluginName != pluginCfg.Name {
  			continue
  		}
  		pluginConfig, err := GetAdmissionPluginConfigurationFor(pluginCfg)
  		if err != nil {
  			return nil, err
  		}
  		return pluginConfig, nil
  	}
  	// there is no registered config that matches on plugin name.
  	return nil, nil
  }
docs: // ConfigFor returns a reader for the specified plugin.
  // If no specific configuration is present, we return a nil reader.