runu on arm64

[schoeppi5]

I am currently trying to get runu working on my Raspberry Pis 4 / 5 using Talos Linux for the Kubernetes layer.

While I was unable to cross-compile runu for arm64, I was able to compile it natively on the Raspberry Pi 5 (binary started, testing pending).

Although it seems to be possible to cross-compile runc nsenter CGo code for arm64, I haven't tried it yet. (nsenter seems to be the only issue when cross-compiling).

The more interesting alternative - imo - would be to natively compile runu using arm64 GitHub runners, which are currently in closed beta.

I do understand, that my use-case is a very niche one, I think the value in running unikernels on arm64 should not be underestimated, since ARM and unikernels would be a perfect fit for things like e.g. embedded-on-the-edge (automotive, IoT, etc.).

I will continue my testing and update this issue as I go.

I am very interested in your thoughts on the topic!