I have an application that needs to run under 2 different name/configuration on the same box. I have read the mix release documentation but I can’t figure out how I can do this. For dynamic configuration, it says that I need to create a config/releases.exs file as such:

import Config
config :my_app, :secret_key, System.fetch_env!("MY_APP_SECRET_KEY")

However I have some config value that I cannot be put in an environment variable, is there a way to have a config.exs file per application name on the target machine ?

Here’s my mix.exs project section.

  def project do
    [
      app: :my_app,
      version: "0.1.0",
      elixir: "~> 1.9",
      start_permanent: Mix.env() == :prod,
      deps: deps(),
      releases: [
        as: [
          include_executables_for: [:unix],
          applications: [runtime_tools: :permanent]
        ],
        vs: [
          include_executables_for: [:unix],
          applications: [runtime_tools: :permanent]
        ]
      ]
    ]
  end

I would like to have different runtime config for the as and vs app names.