code: func (b *BuildArgs) FilterAllowed(filter []string) []string {
  	envs := []string{}
  	configEnv := opts.ConvertKVStringsToMap(filter)
  
  	for key, val := range b.GetAllAllowed() {
  		if _, ok := configEnv[key]; !ok {
  			envs = append(envs, fmt.Sprintf("%s=%s", key, val))
  		}
  	}
  	return envs
  }
docs: // FilterAllowed returns all allowed args without the filtered args