Problems building base docker images from Dockerfile

[vruano]

Description

Using latest tagged release v3.2.2 but probably also affects master:

The build stops at Dockefile line 69:

ln. 69 RUN $CONDA_DIR/bin/conda create -n mitofinder_env --experimental-solver=libmamba python=2.7

The complain is that --experimental-solver argument does not exists.

Aparent workaround/fix:

I simply removed the "experimental part" and it works:

ln. 69 RUN $CONDA_DIR/bin/conda create -n mitofinder_env --solver libmamba python=2.7