feat: format via 'ls **/*.nix | each { |it| nixfmt $it.name }'

outputs/aarch64-darwin/src/frieren.nix

@@ -9,7 +9,8 @@
   system,
   genSpecialArgs,
   ...
-} @ args: let
+}@args:
+let
   name = "frieren";
 
   modules = {
@@ -33,7 +34,8 @@
   };
 
   systemArgs = modules // args;
-in {
+in
+{
   # macOS's configuration
   darwinConfigurations.${name} = mylib.macosSystem systemArgs;
 }