Provide installation script for Bazzite

I have been testing my BC-250 with the latest Bazzite builds and everything works out of the box.

The only missing piece is the GPU governor.

I created an installation script that builds it inside a Distrobox container and then installs it as a systemd user service: https://github.com/evdokim/bazzite-bc-250-governor

If you believe that it can benefit others, I can create a pull request