multi-user toggle init

modules/apps/music.nix

@@ -7,12 +7,17 @@
 {
   options.my.apps.piano.enable = lib.mkEnableOption "piano learning and music theory apps";
   config = lib.mkIf config.my.apps.piano.enable {
-    users.users.jawz.packages = builtins.attrValues {
+    users.users = let
+      users = if lib.isString config.my.toggleUsers.apps then [ config.my.toggleUsers.apps ] else config.my.toggleUsers.apps;
+      packages = builtins.attrValues {
       inherit (pkgs)
         neothesia
         linthesia
         timidity
         ;
-    };
+      };
+    in lib.mkMerge (map (user: {
+        ${user}.packages = packages;
+      }) users);
   };
 }