code: func (g *GPG) ListPublicKeyIDs(context.Context) ([]string, error) {
  	if g.pubring == nil {
  		return nil, fmt.Errorf("pubring is not initialized")
  	}
  	ids := listKeyIDs(g.pubring)
  	if g.secring != nil {
  		ids = append(ids, listKeyIDs(g.secring)...)
  	}
  	return ids, nil
  }
docs: // ListPublicKeyIDs does nothing