add desktop platform

home/platforms/fabian@posixlycorrect/gui/startx.nix

@@ -0,0 +1,26 @@
+{
+  config,
+  pkgs,
+  lib,
+  ...
+}:
+with lib; let
+  cfg = config.local.gui.startx;
+in {
+  options.local.gui.startx.enable = mkEnableOption "startx";
+  config = mkIf cfg.enable {
+    xsession.enable = true;
+
+    home.file.".xinitrc".source = let
+      content =
+        if config.local.nixos
+        then ''
+          exec ~/.xsession
+        ''
+        else ''
+          exec ${pkgs.nixgl.nixGLIntel}/bin/nixGLIntel ~/.xsession
+        '';
+    in
+      pkgs.writeShellScript "xinitrc" content;
+  };
+}