rm: fix nixosPath

nixosPath would get reified in the nix store as /nix/store/<hash>-nixos
which breakes any referenced from within ./nixpkgs/nixos to ../lib or
../pkgs

src/kubenix.nix

@@ -10,7 +10,6 @@ let
 
   defaultSpecialArgs = {
     inherit kubenix;
-    nixosPath = pkgs.path + "/nixos";
   };
 
   # evalModules with same interface as lib.evalModules and kubenix as

src/modules/testing/default.nix

@@ -1,4 +1,4 @@
-{ nixosPath, config, pkgs, lib, kubenix, ... }:
+{ config, pkgs, lib, kubenix, ... }:
 
 with lib;
 let

src/modules/testing/runtime/nixos-k8s.nix

@@ -1,7 +1,6 @@
 # nixos-k8s implements nixos kubernetes testing runtime
 
-{ nixosPath
-, config
+{ config
 , pkgs
 , lib
 , ...
@@ -74,7 +73,7 @@ let
   '';
 
   test =
-    with import "${nixosPath}/tests/kubernetes/base.nix" { inherit pkgs; inherit (pkgs) system; };
+    with import "${pkgs.path}/nixos/tests/kubernetes/base.nix" { inherit pkgs; inherit (pkgs) system; };
     mkKubernetesSingleNodeTest {
       inherit extraConfiguration;
       inherit (config.testing) name;

tests/default.nix

@@ -2,8 +2,6 @@
 , lib ? pkgs.lib
 , kubenix ? (import ../. { }).default
 
-, nixosPath ? toString <nixpkgs/nixos>
-
 , k8sVersion ? "1.21"
 , registryUrl ? throw "Registry url not defined"
 , throwError ? true # whether any testing error should throw an error
@@ -58,7 +56,7 @@ let
       inherit pkgs;
     };
     specialArgs = {
-      inherit kubenix nixosPath;
+      inherit kubenix;
     };
   }).config;
 in