Skip bud with --cpu-shares test on runc/cgroupsv2

A bug is present in some versions of runc (including 1.2.8) which result
in the wrong number of CPU shares being used.  Since the runc version
may change in a future commit, but still contain the bug, simply skip
the test rather than checking against the miscalculated value.

Signed-off-by: Chris Evich <cevich@redhat.com>
Assisted-by: Claude (Anthropic)

tests/bud.bats

@@ -3773,6 +3773,11 @@ _EOF
   skip_if_rootless_and_cgroupv1
   skip_if_no_runtime
 
+  if grep -Fq 'runc' <<< "${OCI}"; then
+    # Ref: https://github.com/opencontainers/runc/issues/4772
+    skip "runc miscalculates cpu shares on cgroupv2"
+  fi
+
   _prefetch alpine
 
   local shares=12345