Add pypi build and publish to CD

[aidanheerdegen]

Add automated PyPI publishing to CD Workflow.

Closes #361

[coveralls]

coverage: 42.016%. remained the same when pulling 8b44917 on aidanheerdegen/issue361 into 6a1d1de on master.

[aidanheerdegen]

Seeing as I managed to accidentally publish 1.0.19 to PyPI I guess that bit actually works. 😆

https://pypi.org/project/payu/1.0.19/

I'll leave that published version up, as we currently have no candidate for a tagged release.

[dougiesquire]

A couple of comments/questions

Also, is there any value in having the conda build use the PyPI dist, e.g. here? This ensures that the PyPI and conda dists are always the same (though I don't know how they wouldn't be...) and makes the conda build dependent on a successful PyPI build (which could be seen as good or bad...)

[aidanheerdegen]

Thanks for the review. Lots of good feedback.

Also, is there any value in having the conda build use the PyPI dist

Probably there is yes, though this is mostly about not having a completely out of date version on PyPI, but that is not intended to be the official distribution channel.

Having said which, I always found it confusing that conda and pip install seemed to use slightly different, but overlapping, configuration/meta-data. If they can be made to be completely compatible then yeah, probably a good idea.

Not sure I am the person to do that, so someone else** could either make those changes in this PR, or make a subsequent PR to align them.

** @dougiesquire

[dougiesquire]

could either make those changes in this PR, or make a subsequent PR to align them

Let's merge this since it does the job (hopefully), and maybe leave that for another PR?