The new signing and push process in place since 2020-03-25 doesn't require anything than just tagging pkgs to -testing repository.
As soon as you will have "tag-built" packages to -testing, that will trigger a distRepo task on koji and also a push to buildlogs.centos.org Assuming that your tag is "cloud7-openstack-train-testing", and that you have three archictectures enabled (x86_64,ppc64le and aarch64) that means that it will appear on