move inherits and add attrset for imports

platforms/nix-darwin/default.nix

@@ -1,4 +1,7 @@
 { lib, ... }:
 {
-  imports = lib.filesystem.listFilesRecursive ./.;
+  imports = lib.pipe (lib.filesystem.listFilesRecursive ./.) [
+    # Get only files ending in .nix
+    (builtins.filter (name: lib.hasSuffix ".nix" name))
+  ];
 }