Build virtual repro test environment on top of the payu conda environment

[jo-basevi]

This CLEX CMS blog entry outlines how to build virtual environments on top of conda environments and retain access to all the packages: https://climate-cms.org/posts/2024-06-05-mixing-python-envs.html#virtual-environments

So it might be possible to create test virtual environments on top of a released vk83 payu environment. This could reduce the size of environments used for reproducibility testing.

[anton-seaice]

Yes please - I would use this :)