Add releases

mix.exs

defmodule TestSvc.MixProject do
  use Mix.Project

  def project do
    [
      app: :test_svc,
      version: "0.1.0",
      elixir: "~> 1.12",
      elixirc_paths: elixirc_paths(Mix.env()),
      compilers: [:gettext] ++ Mix.compilers(),
      start_permanent: Mix.env() == :prod,
      aliases: aliases(),
      releases: releases(), # Add releases line
      deps: deps()
    ]
  end
  
  defp releases() do
    [
      test_svc: [
        include_executables_for: [:unix]
      ]
    ]
  end
  
  ...
end