Add multi-user support for package installations across various modules

Updated multiple configuration files to include a `merge` option for user management, enhancing the ability to handle multi-user setups for applications and services. This change improves flexibility in managing user-specific package installations, ensuring a more streamlined configuration process.

modules/dev/docker.nix

@@ -20,6 +20,7 @@ in
       users = lib.mkOption {
         type = lib.types.either lib.types.str (lib.types.listOf lib.types.str);
         default = config.my.toggleUsers.dev;
+        merge = inputs.self.lib.mergeUsersOption lib;
         description = "Users to install Docker packages for";
       };
     };