Micromamba activate error fix

[jo-basevi]

Currently micromamba issue is happening at build time when creating module inserts, and failing to run micromamba activate

[jo-basevi]

Same error:

info     libmamba ****************** Backtrace Start ******************
debug    libmamba Loading configuration
trace    libmamba Compute configurable 'create_base'
trace    libmamba Compute configurable 'no_env'
trace    libmamba Compute configurable 'no_rc'
trace    libmamba Compute configurable 'rc_files'
trace    libmamba Compute configurable 'root_prefix'
critical libmamba Could not use default root_prefix "/home/srv/**/.local/share/mamba": Directory exists, is not empty and not a conda prefix. Please set explicitly `MAMBA_ROOT_PREFIX` to "/home/srv/**/.local/share/mamba" to skip this error.
info     libmamba ****************** Backtrace End ********************

Will try setting MAMBA_ROOT_PREFIX to avoid defaulting to $HOME directory.

[jo-basevi]

Setting MAMBA_ROOT_PREFIX seems to solve the issue. I noticed MAMBA_ROOT_PREFIX is also now needed for the tests.

I've copied the generated tar file for the payu/dev build (/g/data/vk83/testing/admin/conda_containers/prerelease/staging/conda_base.payu-dev.tar) and confirmed that the module file insert has been generated.

Succesful workflow pbs logs:

# Build
/g/data/vk83/testing/admin/conda_containers/prerelease/logs/build_payu-dev.e166302120
# Test
/g/data/vk83/testing/admin/conda_containers/prerelease/logs/test_payu-dev.o166302289

[atteggiani]

The changes look good.

I left one comment, but feel free to disregard it.