wip: feat: Add host deertopia

hosts/deertopia/configuration.nix

@@ -0,0 +1,87 @@
+{ config, pkgs, lib, disko, /* sydnix-cli, */ ... }:
+{
+  imports = [
+    ./hardware-configuration.nix
+    ./disko-config.nix
+    ./services.nix
+  ];
+
+  sydnix = {
+    filesystemType = "btrfs";
+
+    users.users = [
+      "arisu"
+    ];
+
+    impermanence = {
+      enable = true;
+      directories = [
+        # "Warning: Neither /var/lib/nixos nor any of its parents are persisted.
+        # This means all users/groups without specified uids/gids will have them
+        # reassigned on reboot."
+        "/var/lib/nixos"
+        # We don't want to have different ssh keys on reboot, because ssh keys
+        # are expected to consistently identify machines... I think.  I mostly
+        # just think it's annoying to edit ~/.ssh/known_hosts all the time.
+        "/etc/ssh"
+      ];
+      rollback = {
+        enable = true;
+        device = "/dev/sda2";
+        subvolume = "rootfs";
+      };
+    };
+  };
+
+  boot.loader = {
+    systemd-boot.enable = true;
+    efi.canTouchEfiVariables = true;
+  };
+
+  time.timeZone = "America/Denver";
+
+  i18n.defaultLocale = "en_US.UTF-8";
+
+  console = {
+    font = "Lat2-Terminus16";
+    # keyMap = "us";
+    useXkbConfig = true; # use xkb.options in tty.
+  };
+
+  services.xserver.xkb.layout = "us";
+  services.xserver.xkb.options = "caps:escape";
+
+  environment.systemPackages = with pkgs; [
+    neovim
+    git
+    # sydnix-cli.packages.x86_64-linux.default
+  ];
+
+  services.openssh.enable = true;
+  services.openssh.settings.PermitRootLogin = "yes";
+
+  # TODO: Move to defaults.
+  users.mutableUsers = false;
+
+  # This option defines the first version of NixOS you have installed on this
+  # particular machine, and is used to maintain compatibility with application
+  # data (e.g. databases) created on older NixOS versions.
+  #
+  # Most users should NEVER change this value after the initial install, for any
+  # reason, even if you've upgraded your system to a new NixOS release.
+  #
+  # This value does NOT affect the Nixpkgs version your packages and OS are
+  # pulled from, so changing it will NOT upgrade your system - see
+  # https://nixos.org/manual/nixos/stable/#sec-upgrading for how to actually do
+  # that.
+  #
+  # This value being lower than the current NixOS release does NOT mean your
+  # system is out of date, out of support, or vulnerable.
+  #
+  # Do NOT change this value unless you have manually inspected all the changes
+  # it would make to your configuration, and migrated your data accordingly.
+  #
+  # For more information, see `man configuration.nix` or
+  # https://nixos.org/manual/nixos/stable/options#opt-system.stateVersion .
+  system.stateVersion = "24.05"; # Did you read the comment?
+}