Describe the intended use case

• What your general environment is if it's relevant to the feature request and is not a generic console with a typical Pyenv installation (CI, server with a custom setup, cloud environment, IDE)

In PR CI checks, if there are changes to the build logic but no script changes, they are only tested against macos-latest and ubuntu-latest

• What you are trying to achieve

Those should be tested against all available Ubuntu and MacOS versions

Describe the solution you'd like

Add to the ubuntu-build and macos-build jobs additional jobs that would run if plugins/python-build/bin/python-build is changed, in other (non-latest) Ubuntu/MacOS runners.

Describe alternatives you've considered
N/A

Additional context
N/A