Install the last mamba version
Sounds like there is already an old mamba installed in the env, which looks to be incompatible with the conda version.
This MR basically use the last available mamba to install the env.
It was really tricky to make this stuff working.
- It was needed to install mamba inside a conda env
- From this conda env the global channel are not available
- So what the channels have to be redefined here
Edited by Valentin Valls