Create a more varied set of tests
currently, we have tests:
- using embedded/system dependencies,
- using cmake 3.5/3.10,
- using a specific
PDI_PLUGIN_PATH
or not.
We should also test:
- the latest / earliest valid version of the dependencies,
- using openmpi/mpich/sequential.
All of this is basically tested with our deb/RPM packaging system, however it would be great to have the tests run directly for each MR. Docker images built using spack would be great for that.