Add more docker image labels

[nitrocode]

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• I'd be willing to implement this feature (contributing guide)

Describe the user story

I'd like to know more information on the images I use

Current labels

atlantis/docker-base/Dockerfile.alpine

Line 5 in db9f022

LABEL authors="Anubhav Mishra, Luke Kysow"

Describe the solution you'd like

Suggested labels prefixed with org.opencontainers.image

• source: URL to get source code for building the image
• revision: Source control revision identifier for the packaged software
• base.digest: Digest (hash) of the image this image is based on
• base.name: Image reference of the image this image is based on
• version: Version of the packaged software

https://github.com/opencontainers/image-spec/blob/main/annotations.md#back-compatibility-with-label-schema

https://snyk.io/blog/how-and-when-to-use-docker-labels-oci-container-annotations/

https://github.com/docker/build-push-action

https://github.com/docker/metadata-action

https://docs.docker.com/build/ci/github-actions/examples/#manage-tags-and-labels

https://github.com/runatlantis/atlantis/blob/main/.github/workflows/atlantis-base.yml

https://github.com/runatlantis/atlantis/blob/main/.github/workflows/atlantis-image.yml

Edit: After #2897

✗ docker inspect ghcr.io/runatlantis/atlantis-base:latest-debian |
jq -r '.[0].Config.Labels'

{
  "org.opencontainers.image.created": "2022-12-29T21:32:22.723Z",
  "org.opencontainers.image.description": "Terraform Pull Request Automation",
  "org.opencontainers.image.licenses": "NOASSERTION",
  "org.opencontainers.image.revision": "b06e3f2c632612dd8a70a7a83713f8aa92bb3e06",
  "org.opencontainers.image.source": "https://github.com/runatlantis/atlantis",
  "org.opencontainers.image.title": "atlantis",
  "org.opencontainers.image.url": "https://github.com/runatlantis/atlantis",
  "org.opencontainers.image.version": "main"
}

✗ docker inspect ghcr.io/runatlantis/atlantis:dev-alpine |
jq -r '.[0].Config.Labels'

{
  "authors": "Anubhav Mishra, Luke Kysow",
  "org.opencontainers.image.created": "2022-12-29T21:32:34.237Z",
  "org.opencontainers.image.description": "Terraform Pull Request Automation",
  "org.opencontainers.image.licenses": "NOASSERTION",
  "org.opencontainers.image.revision": "b06e3f2c632612dd8a70a7a83713f8aa92bb3e06",
  "org.opencontainers.image.source": "https://github.com/runatlantis/atlantis",
  "org.opencontainers.image.title": "atlantis",
  "org.opencontainers.image.url": "https://github.com/runatlantis/atlantis",
  "org.opencontainers.image.version": "main"
}

Describe the drawbacks of your solution

None

Describe alternatives you've considered

Cutting a new image and labeling that. I already do this but id like to some base labels with the metadata i mentioned above