Lumen php artisan config:cache not found

I'm trying out the PHP micro Framework Lumen (from laravel).When I set up Lumen and I try to use the php artisan config:cache command like in Laravel, I get this error :

[InvalidArgumentException]
There are no commands defined in the "config" namespace.

So I have problem when I try to deploy the files to server, so I have to change .env file to change the database username and password.

This makes me think config is not available in artisan

How can I add it to artisan ?