Only trigger cd when ci is successful

[tbkr]

• Push project to pypi only if ci is succeeding

This is now relying on https://docs.github.com/en/actions/writing-workflows/choosing-when-your-workflow-runs/events-that-trigger-workflows#workflow_run as well as pushed tags.

So the push to pypi is only triggered in case the ci was successful in the first place.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.77%. Comparing base (0d6c2a4) to head (6167ee0).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop      #35   +/-   ##
========================================
  Coverage    94.77%   94.77%           
========================================
  Files            3        3           
  Lines          134      134           
========================================
  Hits           127      127           
  Misses           7        7           

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[TomHodson]

It wouldn't hurt to merge this and test it but I suspect that you will need to remove the lines

  push:
    tags:
      - "**"

otherwise it may trigger the workflow both on push and when the CI completes.

[tbkr]

I integrated the cd step into the ci workflow because I can rely on the results of the former stages there. Added the filtering for tags as well, because otherwise a new artifact will be pushed to pypi for each run of the ci.