New CI with Github Actions

[simonlegrand]

Here is a first contribution to the new FreeFem CI.

5 different configurations of FreeFem are tested:

• Minimal version
• Sequential version (with all dependencies)
• Full version OpenMPI
• Full version MPICH
• Full version MS-MPI

Each of these workflows contains jobs for Debug and Release and different combinations of platforms.

Currently, the build step doesn't work for the following configuration:

• Sequential/Windows/Debug
• Full Version MS-MPI/Debug
• Full Version OpenMPI/MacOS-14/*

But most of the tests should fail because of the removal of the continue-on-error: true at the make check step (few tests fail for almost each config). It can be temporarily put back if you prefer.

At first, if you prefer to merge on a different branch, just add the branch name in the

on:
  push:
    branches:
      ..
      - <branch_name>

Finally, due to the particular development workflow (push to test), the commit history is particularly dirty and should probably be squashed before the merge. It can be retrieved here

Cheers,
Simon

[prj-]

Why do you need to install SuiteSparse explicitly when building PETSc? Can't you let PETSc install it? Also, there are a couple of parallel packages in the sequential installs (ParMmg, ParMETIS, to name a few).

[simonlegrand]

Bien vu, I stupidly copy paste former tests. I'm not completely familiar with all the dependencies, can you confirm that I didn't leave anything uselss?

[simonlegrand]

Thanks ;)

[simonlegrand]

Three previous comments fixed in 92027eb