Fix CI
Sometimes the CI fails with "Invalid docker image". This happens when a runner with "db" in its name is used. These runners can be excluded when additionally requiring the tag cvmfs. Since we need cvmfs anyways this should be fine.
Sometimes the CI fails with "Invalid docker image". This happens when a runner with "db" in its name is used. These runners can be excluded when additionally requiring the tag cvmfs. Since we need cvmfs anyways this should be fine.