title: Add new service using laravel sail
body: <p>I have a laravel 8 project created with composer. Then I added laravel sail by <code>composer require laravel/sail</code> and then executed command <code>php artisan sail:install</code>.
  After <code>sail up</code> command, only <code>mysql</code> container was created and everything works well. But now I want to add <code>redis</code> to my docker container. How can I do this? I have no knowledge with Docker but laravel sail has made it very easy to use Docker. I want to add <code>redis</code> with the help of laravel sail. Is there any way to do that?</p>