Pin dependencies with poetry, and use this in CI

[DMRobertson]

1. Use poetry rather than setuptools to define the package.
2. Use workflows in backend-meta and the setup-python-poetry action to use poetry in CI.

[DMRobertson]

I need to update this with a description of the diff between wheels and sdists before and after poetry.

[DMRobertson]

I need to update this with a description of the diff between wheels and sdists before and after poetry.

These are a diff from a489866070963f2ee686d9f96e21c876636dafdc to e9e1b7d.

sdist.diff.txt wheel.diff.txt

In the sdist:

• no more MANIFEST.in, matrix_sydent.egg-info
• poetry includes matrix_is_test, scripts, scripts-dev, matrix-sydent.service, pyproject.toml,
• poetry generates a PKG-INFO and setup.py with more metadata
• poetry includes an openmarket change because that branch doesn't have a489866070963f2ee686d9f96e21c876636dafdc

In the wheel:

• poetry does NOT include matrix_is_test
• poetry generates a slightly more complete METADATA file
• poetry's RECORD file is slightly different: entries are sorted alphabetically, whereas sydent lists files before subdirectories. Additionally, openmarket.py has a different hash, but that's expected because the poetry branch doesn't have a489866070963f2ee686d9f96e21c876636dafdc
• poetry marks itself as the generator of the WHEEL file

So TL;DR there are some slight differences, but I think everything is legitimate.

[reivilibre]

no more MANIFEST.in I was going to reply: Somewhat paradoxically-sounding, I would think MANIFEST.in should be included in the sdist. Python's docs say that it is by default: https://packaging.python.org/en/latest/guides/using-manifest-in/#how-files-are-included-in-an-sdist.

But actually I think you're not even using it anymore; instead configuring the sdist through Poetry. That sounds fine then, since pyproject.toml is included. Will review rest..

[DMRobertson]

@reivilibre I've fixed a typo which means that CI actually runs now. Maybe you'd like to have a quick look over the CI output to see if it's to your liking?

[reivilibre]

yep, looks like a decent CI output layout! @DMRobertson