Release builds in CI not installing dependencies and not recognising [express] extra

[LiamConnors]

If you download and install a release build from CI, it no longer picks up that there is an express extra:

Processing .../plotly-6.0.0-py3-none-any.whl (from plotly==6.0.0)
WARNING: plotly 6.0.0 does not provide the extra 'express'

Additionally, required dependencies like narwhals are not installed.

@marthacryan

[marthacryan]

This is a result of #4970. It just requires a couple lines in the pyproject.toml, so this is a quick fix! One thing I'm noticing as I look into this though is the file requires-optional.txt - I think this is meant to be used as pip install plotly[optional] - is that documented anywhere? And do we want to keep supporting it?

[emilykl]

@marthacryan As far as I can tell, requires-optional is intended to be a list of ALL dependencies used by any subpackage of Plotly.py, plus packages needed for setting up a local dev workflow. It's referenced in CONTRIBUTING.md dev setup instructions.

Probably it should be cleaned up and renamed to requires-dev.txt, maybe even exposed as a plotly[dev] extra. We discussed doing both of those things in #4644 , but in the interest of getting the PR out sooner we never went ahead with it..