CI : add workflow to deploy to PyPi on tag push

[ultrabug]

• inspiration : https://github.com/ultrabug/mkdocs-static-i18n/blob/main/.github/workflows/deploy-release.yml

[lasers]

@ultrabug ! 2 years 4 months 28 days 3 hours 14 minutes 11....

[ultrabug]

I just had to wait for https://snarky.ca/how-to-publish-to-pypi-using-github-actions-securely/ to be written

[ultrabug]

starting to work on it #2337

[ultrabug]

done, to be tested on next tag