handles build_num as comparable to year_month or year_month_day in docker tags

[pluralistix]

What are you trying to accomplish?

docker images tagged with name:999 and name:1007 should be comparable. ATM they are not.

see #11198

Anything you want to highlight for special attention from reviewers?

I'm pretty certain, that this is the wrong way. The PR is more to illustrate the linked issue.

Checklist

• [ ✅ ] I have run the complete test suite to ensure all tests and linters pass.
• [ ✅ ] I have thoroughly tested my code changes to ensure they work as expected, including adding additional tests for new functionality.
• [ ✅ ] I have written clear and descriptive commit messages.
• [ ✅ ] I have provided a detailed description of the changes in the pull request, including the problem it addresses, how it fixes the problem, and any relevant details about the implementation.
• [ ❓ ] I have ensured that the code is well-documented and easy to understand.