Help pulling docker image into singularity

[GregorySchwing]

I built a docker image which automatically has the base environment of a conda environment activated. when I pull this into singularity, singularity doesn't know the path to python.

"/usr/bin/env python" says command not found.

Here is the docker image link

docker pull go2432/openff-toolkit:0.4.2

How do I set up my docker image so this works flawlessly with singularity?