{:peertube {:instances [{:url "https://framatube.org" :name "Framatube"}]}
 :backend
 {:port #long #or [#env BACKEND_PORT 3000]
  :bg-helper-url
  #or
   [#env BG_HELPER_URL #join ["http://localhost:" #ref [:bg-helper :port]]]}
 :bg-helper {:port #or [#env BG_HELPER_PORT 3005]}
 :frontend
 {:backend-url
  #or
   [#env BACKEND_URL #join ["http://localhost:" #ref [:backend :port]]]}}