nixos-config/users/server/data/default.nix

{
  hostName,
  userName,
  systemArch,
  deviceName,
}:
let
  homeDir = "/home/${userName}";
in
{
  user = {
    name = userName;
    email = "...";
  };

  paths = {
    inherit homeDir;
  };

  device = {
    name = deviceName;
    hostName = hostName;
    systemArch = systemArch;
  };
}