Release aarch64 images

[kreatoo]

I believe the time has finally come to do a proper aarch64 build of Kreato Linux images.

Github Actions is finally available for ARM publicly which means we should be able to start building without additional costs.

There are 2 approaches to do the initial rootfs;

• Cross-compilation
• and using an existing distro to bootstrap, and going from there

I have chosen the latter, mainly because it should be easier and it should cause less problems. I am open to any suggestions about both approaches.

For now the focus will be on;

• Making kreastrap and kpkg work on all distros (destructively or non-destructively)
• Adding new workflows for images after initial image is done

The first part will require some work, as we already use things like /etc/kreato-release on major parts of the codebase. Should be possible though.

For testing, I already have my Macbook and 2 ARM servers to do all the testing/manual builds on. That part should be fine.