chore: add release workflow

[Ian2012]

This PR adds a release workflow to upload the tutor-contrib-harmony plugin to pypi.

This was tested on a fork: https://github.com/eduNEXT/openedx-k8s-harmony/actions/runs/12011623600/job/33481030042, it failed because the PyPi token was missing

[Ian2012]

Only runs for vX.X.X tags (ignore harmony-chart-X.X.X)

[bradenmacdonald]

Might be easier to just put it in a separate repo in the future, but this seems fine for now. I just wonder if we should use tags like harmony-plugin-X.X.X instead of just vX.X.X? I think that would be more clear.

[Ian2012]

Sure, now that versions will be available on PyPI, we can name it as we want. Let me know if I can trigger the workflow on a PR event temporarily to make sure everything is working and to have a first version on PyPI

[bradenmacdonald]

Yes, go ahead and try it please :)

[openedx-webhooks]

Thanks for the pull request, @Ian2012!

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[gabor-boros]

Although I was never asked to review this, from my side it looks good!

[Ian2012]

Plugin is on pipy already, a PR for adding harmony to tpi is already in progress: overhangio/tpi#5

I will close/open this PR as seems buggy