Builds a batch of self-installing NixOS isos using values from config.yaml.
See ssh-keys.nix for landing a root ssh key.
Edit config.yaml and run just on nixos.
root_size is expected to be some value that parted will understand (GB, %).
See also just test to build and run in qemu.
A journalctl command is injected into the bash history of the installer, so to watch progress just 'up arrow' and 'enter'.
Forked from kevincox/nixos-auto-install.