Non-working containers upgrade CI is caused by the fact that all
multinode jobs deploy pacemaker environments.
Currently we cannot upgrade Pacemakerized deployments
anyway (containerization of pacemakerized services is WIP), upgrades
have only been tested with non-Pacemaker deployments so far.
We need a new environment which will not try deploying in a
pacemakerized way. When pacemaker-managed services are containerized, we
can change the job to upgrade an HA deployment (or single-node "HA" at
least), and perhaps even get rid of the environment file introduced
here, and reuse multinode.yaml.