Continuous integration

[RobertPincus]

We're trying to add continuous integration to this repo. A first step is just to compile the kernels and build the libraries; a second step will be to build and run the tests in the Fortran repo using the CUDA implementation of the kernels.

What's needed:

• Change CI environment so that libraries can build (at the moment some CUDA include files are not found)
• Add a workflow that builds and run the tests in the Fortran repo using the CUDA implementation of the kernels. Probably this means building the Fortran API; building the CUDA libraries and moving them; building, running, and checking the results from the Fortran repo.

Continuous integration will run in this repo against the current main branch of RTE+RRTMGP.