enable access for openstack-ci-core

Allow openstack-ci-core group to create tags for
zmq-event-publisher project.

Change-Id: I99a53091940afaa1c187ea04149cb32553b9eaa4
Publications use ZUUL_REF instead of ZUUL_BRANCH.

* .../files/jenkins_job_builder/config/infra-publications.yaml: The
$ZUUL_BRANCH variable is not available in the post pipeline, so use
the $ZUUL_REF variable instead. It contains the branch name we want.

Change-Id: I8ad62a1d191f36a93d057c0fe3092e27c319ce9a
Merge "enable access for openstack-ci-core"
Merge "Publications use ZUUL_REF instead of ZUUL_BRANCH."