Refactor: move checks/lib into lib/ to avoid duplicate lib

Lets avoid the mistake of nixpkgs having multiple
libs

lib/test/container-test.nix

@@ -0,0 +1,30 @@
+test:
+{ pkgs, self, ... }:
+let
+  inherit (pkgs) lib;
+  nixos-lib = import (pkgs.path + "/nixos/lib") { };
+in
+(nixos-lib.runTest {
+  hostPkgs = pkgs;
+  # speed-up evaluation
+  defaults =
+    { config, options, ... }:
+    {
+      imports = [
+        self.clanLib.test.minifyModule
+      ];
+      config = lib.optionalAttrs (options ? clan) {
+        clan.core.settings.machine.name = config.networking.hostName;
+      };
+    };
+  # TODO: Remove this. We should not pass special args in the test framework
+  # Instead each test can forward the special args it needs
+  # to accept external dependencies such as disko
+  node.specialArgs.self = self;
+  _module.args = { inherit self; };
+
+  imports = [
+    test
+    ../../lib/test/container-test-driver/driver-module.nix
+  ];
+}).config.result