check.rb

require 'json'

# by checking the diff
added_in_pr = %w[
  asset_manager
  authenticating_proxy
  bouncer
  calculators
  calendars
  collections_publisher
  contacts
  content_performance_manager
  content_store
  email_alert_api
  email_alert_frontend
  email_alert_service
  feedback
  finder_frontend
  frontend
  government_frontend
  hmrc_manuals_api
  imminence
  info_frontend
  licencefinder
  link_checker_api
  local_links_manager
  manuals_frontend
  manuals_publisher
  maslow
  need_api
  policy_publisher
  publisher
  publishing_api
  release
  router_api
  rummager
  search_admin
  service_manual_frontend
  service_manual_publisher
  short_url_manager
  signon
  smartanswers
  specialist_publisher
  static
  support
  support_api
  transition
  travel_advice_publisher
  whitehall
]

apps = JSON.parse(`curl https://docs.publishing.service.gov.uk/apps.json`)

apps.each do |app|
  unless added_in_pr.include? app["puppet_name"]
    puts app["puppet_name"]
  end
end