Options for running with apptainer #33
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The aim of this pull request is to enable pytest-isolate-mpi to work with apptainer on an HPC system. For this two command line options were added:
--python_executable, which allows to set the path to a custom python with which to run the spawned subsessions, the intention being that this will be the python inside the container.--custom_ini_for_subsessionthat allows the subsession to use a different ini than the outer pytest call. Some of the mpi args can cause problems when used inside an apptainer container, so this is a very flexible way to remove those.