tbx workflow update ignores current directory

[Shmuma]

Summary

Command tbx workflow update doesn't check for the directory it is being run.
If you run it in some subdirectory, it will create .github dir in that directory, instead of updating the top-level .github dir.

Reproducing the Issue

Reproducibility: always

Steps to reproduce the behavior:

1. clone repository with python-toolbox
2. cd to some subdirectory of the project
3. run tbx workflow update there

Expected Behaviour

.github on the top of the repository is updated

Actual Behaviour

New .github dir is created in the wrong place.

[ArBridgeman]

@Shmuma Fair, that's not nice. But part of this is how it's designed -> the CLI expects the user to provide the path and it has a default assuming you're in the root directory. As we're migrating to nox sessions, I would keep this in mind for the future implementation, as there we can access the root directory from the PROJECT_CONFIG. Unfortunately, we cannot safely do this in the tbx directory without potentially affecting the security-issue project, which some Java tools rely on.

[ArBridgeman]

This is done in #720 but for the nox session workflow:generate. Note that nox by default looks for the noxfile.py in the root directory, so if you are not there, you may need to execute something like:

poetry run -- nox -f ../../noxfile.py -s workflow:generate -- all