Voytrekk

You have always been able to claim the games for free on the website.

It is. Maybe they meant CachyOS, which is a popular Arch based distro.

I haven’t dealt with Canon stuff, but the Arch Wiki is a good place to start.

Perhaps a compose file on the raspberry pi. You can have it build the container as part of the compose file, then you can just start your services up with docker-compose up -d --build. The only things you would need to do is update the git repos and rerun the up command. You could also script it to pull the git repos before building.