ci/github-script/merge: improve maintainer check

  user,

  userIsMaintainer,

}) {

  const allByName = files.every(({ filename }) =>

    filename.startsWith('pkgs/by-name/'),

  )

  const packages = files

    .filter(({ filename }) => filename.startsWith('pkgs/by-name/'))

    .map(({ filename }) => filename.split('/')[3])

      'staging',

      'staging-next',

    ].includes(pull_request.base.ref),

    'PR touches only files in `pkgs/by-name/`.': files.every(({ filename }) =>

      filename.startsWith('pkgs/by-name/'),

    ),

    'PR touches only files in `pkgs/by-name/`.': allByName,

    'PR authored by r-ryantm or committer.':

      pull_request.user.login === 'r-ryantm' ||

      committers.has(pull_request.user.id),

  if (user) {

    checklist[`${user.login} can use the merge bot.`] = userIsMaintainer

    checklist[

      `${user.login} is eligible to merge changes to the touched packages.`

    ] = eligible.has(user.id)

    if (allByName) {

      // We can only determine the below, if all packages are in by-name, since

      // we can't reliably relate changed files to packages outside by-name.

      checklist[`${user.login} is a maintainer of all touched packages.`] =

        eligible.has(user.id)

    }

  } else {

    // This is only used when no user is passed, i.e. for labeling.

    checklist['PR has maintainers eligible to merge.'] = eligible.size > 0