code: func (LinuxStrategy) chown(ctx context.Context, username, path string) error {
  	user, err := user.Lookup(username)
  	if err != nil {
  		return err
  	}
  	uid, err := strconv.Atoi(user.Uid)
  	if err != nil {
  		return err
  	}
  	gid, err := strconv.Atoi(user.Gid)
  	if err != nil {
  		return err
  	}
  	return os.Chown(path, uid, gid)
  }
docs: // chown changes ownership of a path.