fix nix assertions in ci validation

Author: syscod3

flake.nix

@@ -26,7 +26,7 @@
       # Machine-agnostic identity defaults (override via env when needed).
       defaultUser =
         let u = builtins.getEnv "NIXCFG_USER";
-        in if u != "" then u else "nixos";
+        in if u != "" then u else "giovanni";
       defaultGitName =
         let n = builtins.getEnv "NIXCFG_GIT_NAME";
         in if n != "" then n else defaultUser;

hosts/categories/laptops.nix

@@ -17,7 +17,6 @@
   networking.networkmanager.enable = true;
 
   # Sound
-  sound.enable = true;
   hardware.pulseaudio.enable = false;
   security.rtkit.enable = true;
   services.pipewire = {