test multiple XIOS versions

[mo-marqh]

This PR introduces a test matrix for CI testing

specifically: current LFRIC revision, head of XIOS2 trunk, head of XIOS3 trunk

(Note: the XIOS3 trunk is included with a patch for making transport configuration suitable for use with limited MPI on github CI runners.)

[mo-nabilbrice]

The workflow looks good to me!

I wonder whether there is an alternative to using cd. It seems like you have to manage the current working directory across multiple steps.

[mo-marqh]

The workflow looks good to me!

I wonder whether there is an alternative to using cd. It seems like you have to manage the current working directory across multiple steps.

I agree, I think there should be better ways to handle this than dancing in and out of directories via cd

I know i've tried to avoid this in a number of places in the test runners

i'll make an issue to target looping back to this