What is the correct way of creating an unattended CD installer, similar to the result of using
preseeid.cfg in Debian? It should do some auto-partitioning & formatting, then execute
nixos-install (how?), add the default user, enable
ssh etc. Is there any how-to besides Building Your Own NixOS CD (which is not very helpful as I don’t need
ssh and friends in the installer, but rather in the installed system instead)?