Add support in CI for AL9
Changes introduced
CI is able to run with AL9. This is only supported for 23.6.20 for the moment. A more generic implementation requires changes in the skeleton
Tests
- Successful run with AL9
23.6.20: https://gitlab.cern.ch/atlas-physics/pmg/mcjoboptions/-/jobs/34064280 - Successful run with CC7
23/6/19: https://gitlab.cern.ch/atlas-physics/pmg/mcjoboptions/-/jobs/34064303