ci: Publish to TestPyPI on tag or by workflow dispatch trigger

[matthewfeickert]

Resolves #151

• Publish to TestPyPI on push events where a tag is pushed that starts with a 'v' (release tags of form vX.Y.Z) or on workflow dispatch events where the maintainer running the workflow has selected the 'true' option from the drop-down menu for whether to publish.
  • The workflow dispatch option defaults to 'false' to avoid accidental publishing.
• Update development docs to reflect that not every commit is published to TestPyPI

[codecov]

Codecov Report

Base: 85.71% // Head: 85.71% // No change to project coverage 👍

Coverage data is based on head (a4d8ffa) compared to base (dc7ffb4).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #176   +/-   ##
=======================================
  Coverage   85.71%   85.71%           
=======================================
  Files           2        2           
  Lines         217      217           
  Branches       48       48           
=======================================
  Hits          186      186           
  Misses         27       27           
  Partials        4        4           

Flag	Coverage Δ
unittests-3.10	85.25% <ø> (ø)
unittests-3.7	84.90% <ø> (ø)

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