Feature Request: Pull and Retag Images From One Environment to Another.

Dear Jib Team,

I would like to suggest a feature that allows users to retag images based on the Jib configuration. The idea is to avoid rebuilding the images from scratch, and instead provide the ability to pull an existing image, retag it, and push it to another registry. This feature would be extremely useful for promoting images from one environment to another, as Jib already performs most of the necessary steps.