PR: Add CI with github actions

[goanpeca]

Fixes #23

• [x] The setup.py dependency and adds CI with linux. (I think that is enough for now 🤷 ?)
• [x] Add release and plublish workflows
• [x] Configure token for the pypi uploader account (getlektor)
• [x] Create tag with v prefix -> https://github.com/lektor/lektor-atom/tree/v0.3.1

[goanpeca]

@nixjdm could you please add the pypi getlektor user as collaborator of the lektor-atom package?

This way I can create a token for this project linked to that user to make the package upload to PyPI

Thanks!

[runfalk]

Very nice work. I think Linux testing is enough as well.

[goanpeca]

I figured I would use this as a test repo for the pre-commit black stuff. It is small enough that we do not really care about splitting this into many commits :-)

[runfalk]

I don't mind adding black in the same PR, but I think we should at least add it in its own commit. Otherwise the history will be a giant mess.

[goanpeca]

For such a small project I think it is a bit irrelevant, but if you guys think it is better to do the one commit workflow, I can do a separate PR (just for cleanliness)

[goanpeca]

@runfalk ok, I left all the machinery but reversed the python formatting and will do in a separate PR and commit :-p. It is more tidy even for a small project.

[nixjdm]

@goanpeca getlektor is now an owner of this and lektor-tags on pypi. :)

[goanpeca]

Added the secrets, this PR should be ready now :-)

[runfalk]

Looks good to me, feel free to merge whenever CI completes.