Add ART username to DB test env
Next step for ATR-28806 (ATR-21941)
Reproducible issue that user not set
singularity exec -e --no-home -B /cvmfs:/cvmfs docker://gitlab-registry.cern.ch/art/art-gitlab-ci-runner:el9-artprod /bin/bash
Apptainer> echo $USER
Apptainer>
So adding a quick fix to the test.
@simmons should USER be setup as part of the ART container?
An alternative (cc @ballbroo) would be to fix the TriggerDB scripts to check that user is part of the env before trying to use it, but this was the first use case where this assumption has failed.