Add openstack/magnum and openstack/magnum-tempest-plugin in required-projects
Append them in required-jobs of vexxhost tenant
- openstack/heat
- openstack/heat-tempest-plugin
- openstack/keystone
+ - openstack/magnum
+ - openstack/magnum-tempest-plugin
- openstack/neutron
- openstack/nova
- openstack/openstack-zuul-jobs
