o/t/ktest: switch to proper rule

This was previously implemented as a macro, lacking proper transitions.
Reimplement it as a proper test rule.

Change-Id: I237a2fcc29ea6dfbb294ce6313c9ff457def12b8
Reviewed-on: https://review.monogon.dev/c/monogon/+/3722
Reviewed-by: Tim Windelschmidt <tim@monogon.tech>
Tested-by: Jenkins CI
diff --git a/osbase/gpt/BUILD.bazel b/osbase/gpt/BUILD.bazel
index 67a54ee..6c561d4 100644
--- a/osbase/gpt/BUILD.bazel
+++ b/osbase/gpt/BUILD.bazel
@@ -1,5 +1,5 @@
 load("@io_bazel_rules_go//go:def.bzl", "go_library", "go_test")
-load("//osbase/test/ktest:ktest.bzl", "ktest")
+load("//osbase/test/ktest:ktest.bzl", "k_test")
 
 go_library(
     name = "gpt",
@@ -31,7 +31,8 @@
     ],
 )
 
-ktest(
+k_test(
+    name = "ktest",
     cmdline = "ramdisk_size=4096",
     tester = ":gpt_test",
 )