The config_path function returns the fully qualified path to your application's config directory. You may also use the config_path function to generate a fully qualified path to a given file within the application's configuration directory:
<?php $path = config_path();

$path = config_path('app.php');
<?php     {

        if ($this->app->runningInConsole()) {

            $this->publishes([

                __DIR__.'/../config/octane.php' => config_path('octane.php'),

            ], 'octane-config');

        }

    }