WARNING: Be careful about assumptions made by this script,
as /dev/sda beeing the target disk etc..

nix-shell -p nixos-generators nixops

Adapt nixos-iso.nix/ nixos-extra.nix (public key & /dev/sdX)

cp $(nixos-generate -c config-iso.nix -f iso) my-nixos.iso

boot the iso in fresh vm (e.g. 25G HDD, 1024 RAM)

ssh into vm

run : miguel-quick-install [desired-hostname]
reboot into new nixos

back on host: 
adapt nixops.nix

run: nixops deploy .. etc