The python executable from the venv is not going to work inside the container as it's a symlink by default. That's a venv that was built on their host OS, and the symlink to the Python binary on the container is not going to work.

You could also pass the `--copies` parameter when creating the initial venv, so it's a copy and not symlinks, but that is not going to work if your on MacOS or Windows (because the binary platform is different to the Linux that's running the container), or if your development Python is built with different library versions than the container you're starting.