nixos/tests/timekpr: hook up in all-tests, migrate to container

nixos/tests/all-tests.nix

@@ -1700,6 +1700,7 @@ in
   tiddlywiki = runTest ./tiddlywiki.nix;
   tigervnc = handleTest ./tigervnc.nix { };
   tika = runTest ./tika.nix;
+  timekpr = runTest ./timekpr.nix;
   timezone = runTest ./timezone.nix;
   timidity = handleTestOn [ "aarch64-linux" "x86_64-linux" ] ./timidity { };
   tinc = handleTest ./tinc { };

nixos/tests/timekpr.nix

@@ -1,13 +1,15 @@
-{ pkgs, lib, ... }:
+{
+  lib,
+  ...
+}:
+
 {
   name = "timekpr";
   meta.maintainers = [ lib.maintainers.atry ];
 
-  nodes.machine =
-    { pkgs, lib, ... }:
-    {
-      services.timekpr.enable = true;
-    };
+  containers.machine = {
+    services.timekpr.enable = true;
+  };
 
   testScript = ''
     start_all()