feature: add opencontainers label to kong docker image

[mikaello]

I would like the distributed docker image to contain the org.opencontainers.image.source label for easy reference back to this repository. This is useful for tools like Renovate that makes updates to repositories when this image gets updates. OCI has standardized a few labels for adding metadata to images: https://github.com/opencontainers/image-spec/blob/main/annotations.md

Currently this is the list of labels:

$ docker inspect kong:latest --format '{{ json .Config.Labels }}' | jq

{
  "maintainer": "Kong Docker Maintainers <docker@konghq.com> (@team-gateway-bot)"
}

[mikaello]

Instead of manually adding the label, you could also use the Docker metadata Github action: https://github.com/docker/metadata-action

[ghost]

What labels are usually added?

[mikaello]

Hm, I haven't seen a common pattern, but the one proposed here is quite common (.source), the docker metadata action would add these:

• org.opencontainers.image.created
• org.opencontainers.image.description
• org.opencontainers.image.licenses
• org.opencontainers.image.revision
• org.opencontainers.image.source,
• org.opencontainers.image.title
• org.opencontainers.image.url
• org.opencontainers.image.version

[mikaello]

I notice that a couple of labels are added now:

$ docker inspect kong:latest --format '{{ json .Config.Labels }}'
{
  "maintainer": "Kong Docker Maintainers <docker@konghq.com> (@team-gateway-bot)",
  "org.opencontainers.image.ref.name": "ubuntu",
  "org.opencontainers.image.version": "22.04"
}

But it would be really nice if also the org.opencontainers.image.source label could be added.

[mikaello]

Any chance org.opencontainers.image.source could be added?