* boot from nixos unstable installer minimal image, or >23.05
    * https://releases.nixos.org/nixos/unstable/nixos-23.05pre470969.0e19daa510e/nixos-minimal-23.05pre470969.0e19daa510e-x86_64-linux.iso
* use serial console via mb ssh
* add ssh authorized key for root
* `nix run github:numtide/nixos-anywhere -- root@93.93.131.8 --flake '.#mb1'`