move release pipeline to gh actions

[epassaro]

Description

• Use setuptools_scm to make an easy transition to new Astropy's package template in the future (Update TARDIS setup and package infrastructure #1216)
• Requires a change in the release name (3.0a<number>) before merging because setuptools_scm is incompatible with our current format.

Motivation and Context

We're trying to migrate as many pipelines as possible to GH Actions.

How Has This Been Tested?

• Testing pipeline
• Reference Data Comparison following these instructions
• Other (please describe)

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• None of the above (please describe)

Checklist:

• My code follows the code style of this project
• My change requires a change to the documentation
• I have updated the documentation accordingly
• I have built the documentation on my fork following these instructions
• I have assigned and requested two reviewers for this pull request

[codecov]

Codecov Report

Merging #1443 (3ee3802) into master (3ac1435) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1443   +/-   ##
=======================================
  Coverage   71.16%   71.16%           
=======================================
  Files          67       67           
  Lines        5521     5521           
=======================================
  Hits         3929     3929           
  Misses       1592     1592           

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