Ship nightly wheels

Motivation: So jwst RT can run on OSX without crashing at trying to build stcal from source.

https://github.com/spacetelescope/RegressionTests/actions/workflows/jwst.yml

Nightly wheel should go to https://pypi.anaconda.org/stsci/simple/

Example workflow: https://github.com/spacetelescope/synphot_refactor/blob/master/.github/workflows/publish-to-pypi.yml