ci: Publish to PyPI on publish of GitHub release

[matthewfeickert]

Description

Resolves #1907.

Checklist Before Requesting Reviewer

• Tests are passing
• "WIP" removed from the title of the pull request
• Selected an Assignee for the PR to be responsible for the log summary

Before Merging

For the PR Assignees:

• Summarize commit messages into a comprehensive review of the PR

* Run the publish package workflow on release events when a GitHub release is published.

[codecov]

Codecov Report

Merging #1968 (28c9a0d) into master (afbc4f3) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1968   +/-   ##
=======================================
  Coverage   98.24%   98.24%           
=======================================
  Files          68       68           
  Lines        4377     4377           
  Branches      726      726           
=======================================
  Hits         4300     4300           
  Misses         45       45           
  Partials       32       32           

Flag	Coverage Δ
contrib	26.57% <ø> (ø)
doctest	60.56% <ø> (ø)
unittests-3.10	96.13% <ø> (ø)
unittests-3.7	96.12% <ø> (ø)
unittests-3.8	96.16% <ø> (ø)
unittests-3.9	96.18% <ø> (ø)

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[matthewfeickert]

After testing this on a demo project the only issue is that we weren't triggering on releases of any type. I tested this works with both releases and pre-releases, so this should get us v0.7.0rc2.