Host packages as pacman repository using GitHub Pages

[sharkwouter]

This will make it so releases are also hosted as a pacman repository using GitHub Pages.

I did one build using it. To test this, add the following to your /etc/pacman.conf:

[linux-chimeraos]
SigLevel = Optional TrustAll
Server = https://sharkwouter.github.io/linux-chimeraos/

Then you can download the packages using the following command:

pacman -Sy linux-chimeraos linux-chimeraos-headers

I've added instructions specific for the ChimeraOS group to the README.

Before merging this PR, make sure to set the GitHub Pages source to GitHub Actions in the settings of the GitHub repo like in the image below:

It would be possible to add signing later, but since right now packages are just downloaded using wget, I don't think that will be needed. Especially since we're using https here, so a man in the middle attack would be very hard to do anyway.

[pastaq]

This is very cool

[sharkwouter]

Is there a timeline on when this will get reviewed?