Automate PyPI action

[nenb]

Description

This PR automates the upload to PyPI. It relies on PyPAs trusted publishing implementation. This means that we do not need to attach any tokens etc to the environment.

A special environment ('publish-pypi') on GitHub for running the job will be created. Inside this environment there will be a requirement for a dev to approve one final time before uploading to PyPI. This means that the dev will have an opportunity to review the build artifact on GitHub (if they so wish) before uploading to PyPI.

Related Issues

#748

Checklist

• Is this code covered by new or existing unit tests or integration tests?
• Did you run make test successfully?
• Do new classes, functions, methods and parameters all have docstrings?
• Were existing docstrings updated, if necessary?
• Was external documentation updated, if necessary?

Additional Notes or Comments

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (b733b3a) 78.54% compared to head (705f8d7) 78.54%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #813   +/-   ##
=======================================
  Coverage   78.54%   78.54%           
=======================================
  Files          81       81           
  Lines        5080     5080           
=======================================
  Hits         3990     3990           
  Misses       1090     1090           

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