[abathur]

https://nix.dev/tutorials/building-and-running-docker-images... asserts that you'd need a remote builder or cross-compiling. So it seems possible (unless maybe there are still enough cross-compile issues?)

[pxc]

Can cross builds hit the main binary caches or is that awaiting Hydra support for content-addressed derivations? Are there big caches for cross-compiled packages?

[ParetoOptimal]

I'm guessing awaiting based on how much rebuilding I had to do yesterday.