Add GPU support to MED-condaenv

[max-anu]

The current med-condaenv uses lavavu-osmesa (a cpu only version of lavavu).

This can be changed to use a GPU by updating the conda environment.yml to remove removing lavavu-osmesa and adding: `dependencies:

• moderngl[headless]
• pip:
  • lavavu`

We should have two environments - CPU and GPU.

[max-anu]

@rbeucher Did we want to change the default to GPU?

[rbeucher]

Are you sure that it is what is going on here. @max-anu @OKaluza We don't have moderngl install for sure but I have installed lavavu not lavavu-osmesa

see here: https://github.com/ACCESS-NRI/MED-condaenv/blob/main/environments/access-med/environment.yml