Defines a behaviour for higher-level Ecto enviroment changes decisor. Whit this is possible change a db connection from/to dev/pro in build time, if we use a .sh script for re-generate one module that implements this.

This module should be passed as decisor: value option on module that extends Krug.EnviromentReader

Utilization Example:

defmodule MyApp.EnviromentDecisor do

  @behaviour Krug.EctoEnviromentDecisor

  @impl Krug.EctoEnviromentDecisor
  def get_enviroment_type() do
    "dev"
  end

end

defmodule MyApp.Enviroment.Reader do

  use Krug.EnviromentReader, decisor: MyApp.EnviromentDecisor, enviroment: MyApp.Enviroment

end