Hey! I'm having trouble with building a Pex based docker image. We're using some old packages (legacy system) and they're compiled for older ctools. I'm thinking I can build the wheels myself inside docker, and then use them either through a private repo or as generated dependencies. My question is - what's the best way to add another install source for pants wheels? I failed to find any docs on this matter.

Options for configuring PyPi repos used by the Pants Python rules: https://www.pantsbuild.org/prerelease/reference/subsystems/python-repos