Change rake to build config first

There are tests which assert that the configuration is correct.
The config is built from documentation so it is useful to have
the configuration be in sync before the specs are run.

Rakefile

@@ -45,4 +45,4 @@ task confirm_config: :build_config do
   end
 end
 
-task default: [:spec, :internal_investigation, :confirm_config]
+task default: [:build_config, :spec, :internal_investigation, :confirm_config]