setup PyPI build pipeline on github

[hannesdelbeke]

Now that #3 is merged in, ideally we now would setup a build pipeline on github, to release this stylesheet to PyPI when there are updates.
I'm currently releasing from my fork.

If you want, you could make me a maintainer of this repo to help with the set up.

here are the setup steps for the release pipeline:

• #7
• Once you have project acces on pypi, you can 'add an API token' with scope unreal_stylesheet in your PyPI account settings.
• Then add a secret to the github repo with name PYPI_API_TOKEN, and paste the API token in there.
  (optionally you can also set up a github environment named PyPI, and add the secret here instead.)

The last PR already merged in a GitHub release workflow, which after following the above steps, will automatically release to PyPI when creating a release in GitHub.
(it does require you to bump the release version in the toml , else the PyPI update will fail)

[leixingyu]

Hi, my account name is: xingyulei

[hannesdelbeke]

hi, I've send you an invite for pypi.
Your role has been set to owner, which enables all permissions.

[leixingyu]

thank you very much, I think I've configured everything correctly, will do a test when an update is needed

[hannesdelbeke]

there actually is 1 update that's not in the latest release,
I haven't released the stylesheet support for disabled combobox. and left it for you, so you can test the release.

• so if you do a release it should add support for the Qcombobox, sicne it's already commited/merged in.
  don't forget to bump the version to 0.0.3 here before you do

[hannesdelbeke]

and since this is on pypi, it now shows other projects that use this in the side bar under "used by" 👍
because these projects have this repo in their toml dependencies

[leixingyu]

This is very cool Hannes,
I'll test this out in the next couple of weeks but I'm pretty low on bandwidth recently, so bear with me with the response time

[leixingyu]

just tested out the pypi build pipeline, very neat