Git caching

This improvement will cache

https://git.noc.ruhr-uni-bochum.de/potentials-workshop-2022/workshop_preparation.git into /srv/conda/envs/notebook/workshop-repo-cache/workshop_preparation

and

https://github.com/pyiron/pyiron-resources.git into /srv/conda/envs/notebook/workshop-repo-cache/pyiron-resources

postBuild

 #!/bin/sh
 
 conda remove --force --yes lammps
-
 conda install --yes https://gitlab.mpcdf.mpg.de/khr/lammps-feedstock/-/raw/main/lammps-2021.10.27-py38h125bc6e_openmpi_2.tar.bz2
 
 jupyter lab build --minimize=False
 
+mkdir -p /srv/conda/envs/notebook/workshop-repo-cache
+cd /srv/conda/envs/notebook/workshop-repo-cache
+git clone https://git.noc.ruhr-uni-bochum.de/potentials-workshop-2022/workshop_preparation.git
+git clone https://github.com/pyiron/pyiron-resources.git
+pwd
+ls -l
+