Update README.md

[mbruns91]

Revised the text; updated the docker run commands

[mbruns91]

I really don't understand the test failing.
I only came across this kind of error

ImportError: cannot import name 'check_allowlist' from 'conda.core.index' (/opt/conda/lib/python3.9/site-packages/conda/core/index.py)

in the context of circular dependencies. I also can reproduce this in my local docker env. I started to play around with the package versions in the environment.yml for the pyiron/base and pyiron/md images, but haven't yet figured out, where the problem originates. And I'm not even sure that I'll solve it this way. Any suggestions @jan-janssen ?

[jan-janssen]

Looks good to me

[jan-janssen]

The trick is basically comparing the last working build with the current build. As the last build was not that long ago I could look both up here on the GitHub actions. Alternatively there is always the option to pull an old image and then check where it might be incompatible. Finally, another hint was the error message being related to conda so then as I did not see any changes regarding conda, mamba was the next related change.