Binder image is broken

[savente93]

hydomt_fiat version checks

• I have checked that this issue has not already been reported.
• I have checked that this bug exists on the latest version of hydomt_fiat.

Reproducible Example

1. go to the examples page on the documentation
2. click on the binder badge

Current behaviour

The build of the binder image fails.

Desired behaviour

The binder image builds so that I can run the examples

Task list

1. investigate why the image build is failing
2. fix that issue

Additional context

The (relevant part of the) build logs for the failing image:

 ---> 6b8ccf6e6d12
Step 39/52 : RUN TIMEFORMAT='time: %3R' bash -c 'time ${MAMBA_EXE} env update -p ${NB_PYTHON_PREFIX} --file "binder/environment.yml" && time ${MAMBA_EXE} clean --all -f -y && ${MAMBA_EXE} list -p ${NB_PYTHON_PREFIX} '
 ---> Running in fede12885871
Channels:
 - conda-forge
 - defaults
Platform: linux-64
Collecting package metadata (repodata.json): ...working... done
Solving environment: ...working... �[91mbash: line 1:     8 Killed                  ${MAMBA_EXE} env update -p ${NB_PYTHON_PREFIX} --file "binder/environment.yml"
time: 50.658
�[0m ---> Removed intermediate container fede12885871
The command '/bin/sh -c TIMEFORMAT='time: %3R' bash -c 'time ${MAMBA_EXE} env update -p ${NB_PYTHON_PREFIX} --file "binder/environment.yml" && time ${MAMBA_EXE} clean --all -f -y && ${MAMBA_EXE} list -p ${NB_PYTHON_PREFIX} '' returned a non-zero code: 137