Install other flavors of Drupal besides just Drupal CMS

Added some options to the nix run .#demo target, along with the start-demo script.

You can now pass a package name, project name, and composer args to the start-demo script to install packages for other site templates/projects. This does support the one-line approach, though to do anything further with the project (such as use drush, etc) you will need to install the flake to get the appropriate environment.

For example:

One-liner to start XB Demo

Make a new directory and cd into it, and then run this command:

nix run github:freelock/drupal-flake#demo -- phenaproxima/xb-demo xb-demo --stability=dev

On my laptop that takes between 2 - 3 minutes to run before it opens a browser window with the Experience Builder demo loaded up. At the end of the "cms" job in your terminal window, it prints the admin username and password you can enter at /user, and then the dashboard shows the XB page you can open and edit, and you're in Experience Builder!

Start a new project from this point

The one-liner is a slick demo trick, but to continue development on a new project, you need the nix flake installed. You can do this after running the one-liner, but you might need to reinstall to use a different project name. Installing the flake first gives you more options:

nix flake init -t github:freelock/drupal-flake
direnv allow (if you have Direnv installed), or
nix develop (if you don't have Direnv available)

... Then you can use the start-demo script to install/configure a project:

start-demo drupal/core-recommended my-new-project