docs: def get_installer_desc(build_context, target) -> tuple:
      """Return a target_name, script_name, package_tarball tuple for `target`"""
      workspace_dir = build_context.get_workspace('CustomInstaller', target.name)
      target_name = split_name(target.name)
      script_name = basename(target.props.script)
      package_tarball = '{}.tar.gz'.format(join(workspace_dir, target_name))
      return target_name, script_name, package_tarball