util/liveiso: Move NixOS configs to subdirectory

Move the NixOS configuration into a subdirectory so that configurations
for other distros can be added as well.

Change-Id: I0462c1a6541878c973be4302c5c5e9e9bfaed2a6
Signed-off-by: Felix Singer <felix.singer@secunet.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/73684
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Elyes Haouas <ehaouas@noos.fr>
Reviewed-by: Michael Niewöhner <foss@mniewoehner.de>

util/liveiso/nixos/graphical.nix

@@ -0,0 +1,73 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
+{ pkgs, lib, ... }:
+
+{
+	imports = [
+		./common.nix
+	];
+
+	hardware.pulseaudio = {
+		enable = true;
+		package = pkgs.pulseaudioFull;
+	};
+
+	security.polkit = {
+		enable = true;
+		extraConfig = ''
+			polkit.addRule(function(action, subject) {
+				if (subject.isInGroup("wheel")) {
+					return polkit.Result.YES;
+				}
+			});
+		'';
+	};
+
+	services.xserver = {
+		enable = true;
+		displayManager = {
+			gdm = {
+				enable = true;
+				autoSuspend = false;
+			};
+			autoLogin = {
+				enable = true;
+				user = "user";
+			};
+		};
+		desktopManager.gnome.enable = true;
+	};
+
+	users.users.user.extraGroups = [ "audio" "video" "input" ];
+
+	environment.systemPackages = with pkgs; [
+		firefox
+		gparted
+		pavucontrol
+	];
+
+	# Remove unnecessary stuff
+	services = {
+		gnome = {
+			evolution-data-server.enable = lib.mkForce false;
+			gnome-online-accounts.enable = lib.mkForce false;
+			gnome-online-miners.enable = lib.mkForce false;
+			gnome-initial-setup.enable = lib.mkForce false;
+			gnome-browser-connector.enable = lib.mkForce false;
+		};
+		telepathy.enable = lib.mkForce false;
+		dleyna-renderer.enable = lib.mkForce false;
+		dleyna-server.enable = lib.mkForce false;
+	};
+
+	programs.geary.enable = lib.mkForce false;
+
+	environment.gnome.excludePackages = with pkgs; [
+		gnome.gnome-weather
+		gnome.epiphany
+		gnome.gnome-contacts
+		gnome-photos
+		gnome.gnome-music
+		yelp
+	];
+}