Publish stable Docker image corresponding to release/X.Y.Z tag

[nutjob4life]

🗒️ Summary

Merge this to take care of an issue in publishing mismatched versions of Docker images to the Docker Hub. Now when pushing release/1.2.3 to GitHub, you get Docker image tagged with :1.2.3 in the Docker Hub.

⚙️ Test Data and/or Report

See the corresponding entries for registry-moppers, the "sandbox" version of this project, namely:

• The GitHub Actions stable workflow for release/3.0.0
• The Docker Hub tags for registry-moppers, which has a corresponding :3.0.0 tag around the same timeframe.

♻️ Related Issues

• 109