reboot system after config

[ruslandoga]

Changes

This solves code injection in extra configs, e.g:

_{my_extra_config.exs}

import Config

defmodule Plausible.Application do
  use Application

  def start(_type, _args) do
    raise "oops"
  end
end

TODOs:

• is there better way?
• does it affect any of the existing configuration?

Tests

• Automated tests have been added

Changelog

• This PR does not make a user-facing change

Documentation

• This change does not need a documentation update

Dark mode

• This PR does not change the UI