transfer.rb

require 'octokit'

repos = %w[
  async_experiments
  business-support-api
  contacts-frontend
  figuring-out-whitehall-types
  github-jenkins-trigger
  govuk_content_api
  govuk_need_api
  govuk-delivery
  govuk-emergency-banners
  govuk-import-export-prototype
  govuk-navigation-prototype
  govuk-random-content-store
  govuk-search-concepts-experiments
  metadata-api
  multipage-frontend
  service-standard-reports-json
  specialist-frontend
]

client = Octokit::Client.new(access_token: "<TOKEN>")

repos.each do |repo|
  client.transfer(
    "gds-attic/#{repo}",
    new_owner: "alphagov",
    accept: "application/vnd.github.nightshade-preview+json"
  )

  client.edit_repository(
    "alphagov/#{repo}",
    archived: true
  )
end