Aim: finish MPSD software environment 23b, including

• have FOSS2021a and FOSS2022a toolchains on all architectures installed for HPC and buildbot
• have octopus-buildbot builders to build octopus for
  • FOSS-2021a-serial
  • FOSS-2021a-mpi
  • FOSS-2021a-CUDA
  • FOSS-2022a-serial
  • FOSS-2022a-mpi
  • FOSS-2022a-CUDA
• have builds passing with no errors (update of tolerances)

If time is tight, we can drop the 2021a-* toolchains as the Octopus team says these are now less interesting (due to their age).