This is a working nix flake I wrote for the PinePhone on the PinePhone.
It successfully updated the system from a 2023-11-15 version to the
latest nixos-unstable release.
This is an initial configuration of the PinePhone with a nixpkgs build
from 2023-11-15. Notably the installer uses uuids by default, so it's up
to the user to specify their own hardware-configuration.nix.