I'm attempting to switch to sphinx-multiversion, but I've run into an issue that I don't think there is an existing solution for. If there isn't, I'm curious if this is something you'd be willing to support and how you'd like it implemented.

I have a project where the code is in one repository and the sphinx docs source files are in another. The docs repository is included in the code repository as a git submodule. So you have something like:

myrepos/
    mypkg/
        __init__.py
    doc/  <-- git submodule
        conf.py

I'd like sphinx-multiversion to take the tags and branches it uses from the code repository (myrepos/), but because doc/ is also a git repository itself sphinx-multiversion is only using the ones defined there. Is it possible to make sphinx-multiversion look one level up for the main repository?