misc fixes
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--contain
option to apptainer to improve isolation (see lhcb/MooreOnline#40 (comment 6919145))lcg-toolchains
is in the slot (see discussion on lchb-dd4hep
problem at PAC on 21st July 2023)/cvmfs/lhcb.cern.ch/containers
to prepare the migration to self hosted slc6 and centos7 apptainer images (instead of using cvmfs-prod)