Fortran compilation tools image

This image contains recent versions of compilers, MPI and HDF5 libraries along with basic build tools (CMake, Ninja). These images can then be used to compile Fortran applications that depend on MPI and HDF5.

The main purpose is to serve the MGLET CFD code with images it can use in its building and testing framework, but it can of be used for other Fortran applications as well.

Three images for different workflows are defined:

1. intel-impi-image: Intel Compilers and Intel MPI
2. gnu-openmpi-image: GNU Compilers and OpenMPI
3. llvm-mpich-image: LLVM Compilers (clang, clang++, flang) and MPICH
4. nag-mpich-image: NAG Fortran compler (nagfor), GNU C and C++ compilers (gcc, g++) and MPICH

The gnu-openmpi-image and llvm-mpich-image are build with Github Actions and are published at the Github container registry. The intel-impi-image and nag-mpich-image are should be built locally due to license restrictions.

If you want to build the images yourself locally, the commands are:

docker build --target intel-impi-image -t intel-impi-image:latest .
docker build --target gnu-ompi-image -t gnu-ompi-image:latest .
docker build --target llvm-mpich-image -t llvm-mpich-image:latest .
docker build --network host --secret id=nag_license,src=$NAG_KUSARI_FILE --target nag-mpich-image -t nag-mpich-image:latest .

The llvm-mpich-image build the latest main branch of the LLVM compilers clang, clang++ and flang from sources. The build time of this image is thus very large (hours) compared to the two others. The reason this builds from source is that the flang receive very frequent updates and this allows us to have the very latest compilers available.

The nag-mpich-image image require you to hold a license for the NAG Fortran compiler for building the image. The path to the license file should be provided in the environment variable NAG_KUSARI_FILE.