Add GitHub action to push to pypi on new Release

[BenGalewsky]

As a serviceX developer I want my new servicex-cli pushed to pypy so others can easily access it

Take a look at the Servicx Frontend repo to see how this is done.

Assumptions

1. Test this out on a test pypy account. I'll add the ServiceX pypy secrets once this looks right

Acceptance Criteria

Given I have made some changes to the cli when I make a GitHub release then then a new package shows up in pypi, with the version set to the GitHub release

[sthapa]

I've generated a test pypi account, what's the best way to test this? Just add a manual trigger and try triggering it?

[BenGalewsky]

I can add your secrets if you lack permission.
Then you should just be able to cut a pre-release on this repo and let the fur fly!

[sthapa]

Alright, let me try adding the secret and I'll ping you if I run into permissions issues