wishlist: annotations on docker/dockerfile images

[tianon]

This is a very low priority wishlist item, but it'd be neat if releases to docker/dockerfile could include at the very least the org.opencontainers.image.version pre-defined annotation so that it is more immediately apparent what version a given image represents. 😄 ❤️

(I think it would also be neat to point org.opencontainers.image.url to something like https://github.com/moby/buildkit/releases/tag/dockerfile%2F1.7.1 for where the release notes are, but that's easy enough to go find given a version number 😄)

[tonistiigi]

Not a replacement for the request, but FYI that the image does support docker run --rm docker/dockerfile:labs --version and the source tag is also present in the provenance attestation.

[crazy-max]

If this is just for releasing, we could probably use the metadata-action: https://github.com/docker/metadata-action/actions/runs/8846523649/job/24292592654#step:4:75