m/n/b/mkverity: produce a combined image

mkverity was updated to output a copy of the source image, with Verity
metadata appended to it, instead of a separate hash image. This is
needed by the upcoming verity rootfs implementation.

Change-Id: I2a311da6851dabf5a09d77551dc3e9d35bcc845f
Reviewed-on: https://review.monogon.dev/c/monogon/+/525
Reviewed-by: Sergiusz Bazanski <serge@monogon.tech>
diff --git a/metropolis/node/build/mkverity/BUILD.bazel b/metropolis/node/build/mkverity/BUILD.bazel
index 8d67da3..2fe6768 100644
--- a/metropolis/node/build/mkverity/BUILD.bazel
+++ b/metropolis/node/build/mkverity/BUILD.bazel
@@ -3,7 +3,10 @@
 go_binary(
     name = "mkverity",
     embed = [":go_default_library"],
-    visibility = ["//visibility:private"],
+    visibility = [
+        "//metropolis/installer/test/testos:__pkg__",
+        "//metropolis/node:__pkg__",
+    ],
 )
 
 go_library(