lib: initial commit, start of custom lib

parts/lib/builders.nix

@@ -0,0 +1,31 @@
+{
+  lib,
+  inputs,
+  self,
+  ...
+}: {
+  mkSystem = {
+    withSystem,
+    system,
+    ...
+  } @ args:
+    withSystem system (
+      {
+        inputs',
+        self',
+        ...
+      }:
+        lib.nixosSystem {
+          inherit system;
+          specialArgs =
+            lib.recursiveUpdate
+            {
+              inherit lib;
+              inherit inputs inputs';
+              inherit self self';
+            }
+            (args.specialArgs or {});
+          inherit (args) modules;
+        }
+    );
+}