Add check-semantic-version GitHub action

[cortadocodes]

Summary

Add a GitHub action utilising the check-semantic-version CLI that can be easily used in GitHub workflows.

Contents (#76)

New features

• Add check-semantic-version GitHub action

Operations

• Use latest setup-python action in workflows
• Use check-semantic-version GitHub action in python-ci workflow
• Add build-docker-image workflow
• Add testing and docker build/push to release workflow

Other

• Update example workflow with check-semantic-version GHA

[codecov-commenter]

Codecov Report

Merging #76 (b80792e) into main (360f1b3) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #76   +/-   ##
=======================================
  Coverage   96.67%   96.67%           
=======================================
  Files           4        4           
  Lines         301      301           
=======================================
  Hits          291      291           
  Misses         10       10           

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