The case for poncho project doesn't seem to apply anymore

[yangm97]

Environment

• Elixir version (elixir -v):
• Nerves environment: (mix nerves.env --info)
• Additional information about your host, target hardware or environment that
  may help

Current behavior

From the post:

By default, umbrella projects have the following in their top-level config/config.exs file:

import_config "../apps/*/config/config.exs"

But when creating an umbrella project, I don't have distinct config files per app, instead this is added into each app's mix.exs:

config_path: "../../config/config.exs",

I suppose the post refers to an old mix behavior, which no longer applies.

Expected behavior

Given umbrella apps seem to have closed the gap of configuration, I would like to see an example nerves project using umbrella instead of poncho.