checkhealth branch is broken if CUDA is installed on a computer without GPU

[jeanfeydy]

Hi @Nizben, @bcharlier, @joanglaunes,

Before you merge the checkhealth branch into main, please note that it is currently broken if CUDA is installed on a computer that does not, actually, host a GPU. This is typically the case on my laptop, where I use our reference Docker image that ships CUDA.

from pykeops import LazyTensor

[KeOps] Warning : Failed to load library cuda: libcuda.so.1: cannot open shared object file: No such file or directory
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/opt/keops/pykeops/pykeops/__init__.py", line 2, in <module>
    import keopscore
  File "/opt/keops/keopscore/keopscore/__init__.py", line 14, in <module>
    from keopscore.config import *
  File "/opt/keops/keopscore/keopscore/config/__init__.py", line 10, in <module>
    cuda_config = CUDAConfig()
                  ^^^^^^^^^^^^
  File "/opt/keops/keopscore/keopscore/config/cuda.py", line 42, in __init__
    self.set_use_cuda()
  File "/opt/keops/keopscore/keopscore/config/cuda.py", line 62, in set_use_cuda
    self.get_gpu_props()
  File "/opt/keops/keopscore/keopscore/config/cuda.py", line 330, in get_gpu_props
    libcuda = ctypes.CDLL(find_library("cuda"))
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/lib/python3.12/ctypes/__init__.py", line 379, in __init__
    self._handle = _dlopen(self._name, mode)
                   ^^^^^^^^^^^^^^^^^^^^^^^^^
OSError: libcuda.so.1: cannot open shared object file: No such file or directory

See you soon,
Jean