- Merge pull request #11896 from todor-ivanov/bugfix_Runtime_CleanupJobsXrdfsFail_fix-11893
  - Discover the singularity container OS at runtime.
  - Merge pull request #11897 from belforte/add-ARC_TO_OS-mapping-for-rhel9-fix-11985
  - fix unit test
  - add support for rhel9. Fix #11985
  - one more item for the code review
  - providing a checklist for code review
  - Merge pull request #11894 from amaltaro/fix-11892
  - fix unit tests
  - Make container level data placement for DQMHarvest; update Start.Policy.Dataset to container too