Specification of cmake builders for Octopus 14 in Gitlab CI

Following a discussion between @lang-m @martin.lueders and @AlexBuccheri , we settled on migrating to this set of builders for Gitlab CI.

The main requirement to introducing these builders is cmake presets, as @lang-m already has spack toolchains written.

A few comments on naming conventions

min and max = minimum and maximum external dependencies.

MPI + OMP could be referred to as parallel.

cmake prefix can be dropped in the naming of the builders.

cmake Builders

Old compiler support (consider a better name)

• Intel cmake production min MPI + OMP
• GCC cmake production min MPI + OMP

New compiler support (consider a better name)

• Intel cmake production min MPI + OMP
• GCC cmake production min MPI + OMP

Stable/current.

• GCC cmake debug max serial
• GCC cmake production max serial
• Intel cmake debug max serial
• Intel cmake production max serial
• GCC cmake debug max MPI + OMP
• GCC cmake production max MPI + OMP
• Intel cmake debug max MPI + OMP
• Intel cmake production max MPI + OMP

Specialised builders

• GCC cmake debug max serial with f-sanitizer flag (start as on-demand)
• GCC cmake production valgrind (with what external dependencies?)

Hardware-specific builders

• NVIDIA cmake production CUDA: V100 or gamer cards (run on both?)
• NVIDIA cmake production CUDA MPI with NVlink
• PowerPC: GCC cmake production max (or as many external dependencies as possible)
• GCC: Subset of the stable builders on AMD machines