gitlab-ci: Disable the riscv64-debian-cross-container by default

This job is failing since weeks. Let's mark it as manual until
it gets fixed.

Message-Id: <82aa015a-ca94-49ce-beec-679cc175b726@redhat.com>
Acked-by: Michael Tokarev <mjt@tls.msk.ru>
Signed-off-by: Thomas Huth <thuth@redhat.com>
1 file changed