ATR-28398: Relax condition to detect OS (relevant for GRID jobs)
Follow up of !66655 (merged).
In case a GRID node is running the job inside a centos7 container, the content of $ALRB_USER_PLATFORM
is not simply centos7
(like it is on lxplus), but rather something like centos7+/cvmfs/atlas.cern.ch/repo/containers/fs/singularity/x86_64-centos7#x86_64
. Since it is centos7 environment, there is no need to launch a centos7 container for the Run-2 RDOtoRDOTrigger step.