Allow for multiple authors

[taqtiqa-mark]

Arises where a container is a composition of several containers. See Buildah issue #591 specifically the current use case given in comment

[taqtiqa-mark]

Will add "Signed-off-by"

[wking]

You can already use the free-form org.opencontainers.image.authors anywhere that takes annotations (which is at least indexes, manifests, and descriptors). I think that covers all image-spec Merkle trees.

[taqtiqa-mark]

Thanks for the heads-up. Still feeling my way a little.....

Does that mean the Config:Properties should be updated to be consistent with the pre-defined annotation keys. For example vendor, revision, version are not mentioned in Config:Properties?

[wking]

Does that mean the Config:Properties should be updated to be consistent with the pre-defined annotation keys. For example vendor, revision, version are not mentioned in Config:Properties?

My impression is that the config properties are deprecated properties which are kept around for backwards compat, and that new metadata should go into annotations. But I'm not sure how widely supported those annotations are in tooling. Are they checked in the absence of the analogous config property? How do tools handle both being set? Is setting org.opencontainers.image.authors on the manifest sufficient, or should it be set on just the config, or both for maximum cross-tool portability? Can a maintainer weigh in with some suggestions (ideally in the form of a implementation-note PR ;)?