Build and pull sail services on installation

[jessarcher]

In laravel/sail#467 I made the sail:install command automatically build and pull the required services so that the first sail up can start serving immediately.

However, when installing Laravel Sail via laravel.build, the sail:install command is run inside a temporary container where it cannot run the docker commands 🤦‍♀️

I have created laravel/sail#468 that prevents sail:install from attempting to run the docker commands when docker is not available.

This PR adds that same functionality to laravel.build so that the first sail up starts serving immediately, no matter how you install Laravel Sail.

[jessarcher]

I have confirmed that if the ./vendor/bin/sail commands fail, the rest of the installation still proceeds. The worst-case scenario is that the initial sail up will have to do the "build and pull" itself.