phone: Add initial configuration

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.

phone/configuration.nix

@@ -0,0 +1,64 @@
+{ config, lib, pkgs, ... }:
+
+{
+  imports = [
+    (import <mobile-nixos/lib/configuration.nix> { device = "pine64-pinephone"; })
+    ./hardware-configuration.nix
+    <mobile-nixos/examples/phosh/phosh.nix>
+  ];
+
+  networking.hostName = "mobile-nixos";
+
+  #
+  # Opinionated defaults
+  #
+
+  # Use Network Manager
+  networking.wireless.enable = false;
+  networking.networkmanager.enable = true;
+
+  # Use PulseAudio
+  hardware.pulseaudio.enable = true;
+
+  # Enable Bluetooth
+  hardware.bluetooth.enable = true;
+
+  # Bluetooth audio
+  hardware.pulseaudio.package = pkgs.pulseaudioFull;
+
+  # Enable power management options
+  powerManagement.enable = true;
+
+  # It's recommended to keep enabled on these constrained devices
+  zramSwap.enable = true;
+
+  # Auto-login for phosh
+  services.xserver.desktopManager.phosh = {
+    user = "user";
+  };
+
+  #
+  # User configuration
+  #
+
+  users.users."user" = {
+    isNormalUser = true;
+    description = "User";
+    password = "user";
+    extraGroups = [
+      "dialout"
+      "feedbackd"
+      "networkmanager"
+      "video"
+      "wheel"
+    ];
+  };
+
+  # This value determines the NixOS release from which the default
+  # settings for stateful data, like file locations and database versions
+  # on your system were taken. It‘s perfectly fine and recommended to leave
+  # this value at the release version of the first install of this system.
+  # Before changing this value read the documentation for this option
+  # (e.g. man configuration.nix or on https://nixos.org/nixos/options.html).
+  system.stateVersion = "23.11"; # Did you read the comment?
+}

phone/hardware-configuration.nix

@@ -0,0 +1,19 @@
+# NOTE: this file was generated by the Mobile NixOS installer.
+{ config, lib, pkgs, ... }:
+
+{
+  fileSystems = {
+    "/" = {
+      device = "/dev/disk/by-uuid/63546625-e99c-4aa4-ba11-ff193ad13047";
+      fsType = "ext4";
+    };
+  };
+
+  boot.initrd.luks.devices = {
+    "LUKS-MOBILE-NIXOS-ROOTFS" = {
+      device = "/dev/disk/by-uuid/28e0bd73-e4fb-4002-9b17-a494823e6999";
+    };
+  };
+
+  nix.settings.max-jobs = lib.mkDefault 2;
+}