Switch to a Commander base to allow lazy loading config

test/app_command_test.rb

@@ -1,6 +1,6 @@
 require "test_helper"
 require "mrsk/configuration"
-require "mrsk/commands"
+require "mrsk/commands/app"
 
 ENV["VERSION"] = "123"
 ENV["RAILS_MASTER_KEY"] = "456"

test/commander_test.rb

@@ -0,0 +1,12 @@
+require "test_helper"
+require "mrsk/commander"
+
+class CommanderTest < ActiveSupport::TestCase
+  setup do
+    @mrsk = Mrsk::Commander.new config_file: Pathname.new(File.expand_path("fixtures/deploy.erb.yml", __dir__))
+  end
+
+  test "lazy configuration" do
+    assert_equal Mrsk::Configuration, @mrsk.config.class
+  end
+end