Update ci workflows

[clintonsteiner]

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📚 Documentation preview 📚: https://python-packaging-user-guide--1775.org.readthedocs.build/en/1775/

[webknjaz]

The idea is initially interesting, but I have a better example.
Mimic these if you want to continue working on this PR: https://github.com/ansible/receptor/blob/794e4c402c7045091e111a3bfc97722a2af214ba/.github/workflows/reusable-nox.yml#L58-L64 / https://github.com/ansible/receptor/blob/794e4c402c7045091e111a3bfc97722a2af214ba/.github/workflows/pull_request.yml#L87-L120. Without the go or project-specific stuff, of course. Follow the naming conventions too.

The "module" should be named reusable-*. The conditionals should live outside that reusable module. The call to nox should be split into provisioning and execution.

Besides that, I'd rather have version bumps in a separate PR.