Don't fetch from the web during build time

[FRidh]

ALL software version info

• Panel 10.2
• NixOS

Description of expected behavior and the observed behavior

Upgrading to panel version 10.2 I noticed it attemps to download files. This was introduced in #1651.

Setuptools allows writing arbitrary Python code, however, the Python packaging world is finally moving away from this for many good reasons. One of the reasons here is that a build should not fetch itself from the web.

Building inside a container without network now fails. We do this in Nixpkgs for purity reasons.

I strongly suggest looking for a different solution. A possible way could be having a separate git repo with the models, and including it as a submodule, if your goal is to avoid bloat in a repo. Or even as a separate Python package.