use mamaba to create conda environments

[tayabsoomro]

Mama improves the speed of creating conda environments through parallel downloads. But there currently is an issue with mamba where it cannot resolve environments from YAML file - it looks like this feature is in pipeline (read here).

The current solution is to create an empty conda environment and update the environment with mamba by providing a YAML file:

conda create -y -n micas python=3.8 mamba
conda activate micas
mamba env update -n micas --file micas.yml

However, according to one comment, it doesn't work quite as expected.

We will have to wait until this feature is enabled in mamba and update our start_micas.sh script to utilize mamba for creating environment faster.