fix: dirac-apptainer-exec: do not use minimal install

[fstagni]

background for this change is this error:

Apptainer command failed with exit code 4
Command output: (4, "Found 4 errors\n    > Command exited with 255: apptainer --silent exec --bind /cvmfs --bind /export/data1/condor/execute/dir_37976/DIRAC_XLi9ygpilot --userns --bind /etc/proxy /cvmfs/cernvm-prod.cern.ch/cvm3 pwd\n    > Working directory inside apptainer (.) doesn't match outside (/export/data1/condor/execute/dir_37976/DIRAC_XLi9ygpilot)\n    > Command exited with 255: apptainer --debug exec --bind /cvmfs --bind /export/data1/condor/execute/dir_37976/DIRAC_XLi9ygpilot --userns --bind /etc/proxy /cvmfs/cernvm-prod.cern.ch/cvm3 pwd\n    > Command exited with 2: lb-run --container apptainer -c best --siteroot=/cvmfs/lhcb.cern.ch/lib DaVinci/v45r5 gaudirun.py --help\n", '')

[chrisburr]

I'm pretty sure this is breaking half of the security gaurentee we get from SingularityCE. If this isn't the case we at the very least need a clear explanation in the description of why it isn't.

I also don't think it even fixes the error in the description.