Change CI to use OpenMPI instead of MPICH #172
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As soon as we fixed one CI problem, another one popped up. GitHub actions recently changed the default ubuntu distro to 22.04 from 20.04, which appears to have caused problems when linking against Nek5000. As far as I can tell, this appears to be related to the use of MPICH, which on Ubuntu 22.04 adds several extra compile flags for link-time optimization. Switching to OpenMPI fixes the problem for me locally 🤞