Triggering publication to PyPi does not work stably

The current method of checking the start of the github ref is not sure to work, e.g., with release 0.2.1. Maybe implementing one of these solutions is better, e.g., triggering on a release as indicated here at the bottom:
https://stackoverflow.com/questions/58475748/github-actions-how-to-check-if-current-push-has-new-tag-is-new-release