modules: change username configuration option

It makes more sense to have a `my.user` option.

flake.nix

@@ -72,7 +72,7 @@
         }
         home-manager.nixosModules.home-manager
         ({ config, ... }: {
-          home-manager.users.${config.my.username} = import ./home;
+          home-manager.users.${config.my.user.name} = import ./home;
           # Nix Flakes compatibility
           home-manager.useGlobalPkgs = true;
           home-manager.useUserPackages = true;

modules/default.nix

@@ -10,11 +10,13 @@
   ];
 
   options.my = with lib; {
-    username = mkOption {
+    user = {
+      name = mkOption {
         type = types.str;
         default = "ambroisie";
         example = "alice";
         description = "my username";
       };
     };
+  };
 }

modules/home.nix

@@ -1,7 +1,7 @@
 # Simplify setting home options
 { config, lib, ... }:
 let
-  actualPath = [ "home-manager" "users" config.my.username "my" "home" ];
+  actualPath = [ "home-manager" "users" config.my.user.name "my" "home" ];
   aliasPath = [ "my" "home" ];
 in
 {

modules/system/users.nix

@@ -20,8 +20,8 @@ in
           inherit (secrets.users.root) hashedPassword;
         };
 
-        ${config.my.username} = {
-          inherit (secrets.users.${config.my.username}) hashedPassword;
+        ${config.my.user.name} = {
+          inherit (secrets.users.${config.my.user.name}) hashedPassword;
           description = "Bruno BELANYI";
           isNormalUser = true;
           shell = pkgs.zsh;