Enhancement: Option to select between full installation and minimal installation

[RealTriassic]

This would be useful for hosts that do not give too much storage. By providing the option to do a minimal installation, we can make sure that Ptero-VM runs on these hosts too.

This would require an alternate version of installer.sh to be created that does not include any preinstalled packages / addons.

On first boot, we could send a prompt to the user in console asking to select between 2 options:

1. Minimal Installation
2. Full Installation

once the user has selected their option, we create a file in the / directory named .minimal or .full, depending on what installation type they selected to prevent minimal installations from being overwritten by full installations and vice versa.

[RealTriassic]

This was added upstream.