build: add useful workflows for maintenance

[mariajgrimaldi]

Description

This PR adds useful GitHub workflows for an easier maintenance job:

• Pypi publishing after new release
• Python requirements update every Monday
• Test suite for better QA

How to test

Either the python reqs and pypi publish job are used in Open edX plugins like: https://github.com/openedx/tutor-contrib-coursegraph/blob/master/.github/workflows/pypi-publish.yml A similar version: https://github.com/openedx/openedx-events/blob/main/.github/workflows/pypi-publish.yml ad they're are proven to be working: https://pypi.org/project/tutor-contrib-coursegraph/ Now, for the test workflow, run the following commands locally:

make dev-requirements
make test-lint
make test-format
make test-pythonpackage

References

Coursegraph plugin existent workflows: https://github.com/openedx/tutor-contrib-coursegraph/tree/master/.github/workflows Community health files templates: https://github.com/openedx/.github

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[itsjeyd]

label: core contributor

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