Add container image metadata with providence information.

[nairb774]

The container images published to Docker Hub seem to be missing metadata about the source of the image. There is a whole list of predefined annotations that could be included: https://github.com/opencontainers/image-spec/blob/main/annotations.md

It would be appreciated if the org.opencontainers.image.source annotation could be added at a minimum. The org.opencontainers.image.revision annotation would be appreciated. This will allow Renovate to include release notes and links to the source repository when it proposes upgrade PRs. Documentation specific to how this feature works for container images: https://docs.renovatebot.com/modules/datasource/docker/#description

Thanks!