Annotations documentation

[dvdksn]

Related to docker/build-push-action#992 (comment)

We already have some parts of our docs about annotations. Maybe we should borrow some bits from https://github.com/moby/buildkit/blob/master/docs/annotations.md?

[crazy-max]

Places where we have annotations without proper examples:

• https://github.com/docker/buildx/blob/master/docs/reference/buildx_build.md
• https://github.com/docker/buildx/blob/master/docs/reference/buildx_imagetools_create.md
• missing override in https://github.com/docker/buildx/blob/master/docs/reference/buildx_bake.md
• https://docs.docker.com/build/bake/reference/#targetannotations is ok but needs to explain how to set annotation at specific level uisng <type>: prefix.

[crazy-max]

I have some ongoing work for the metadata-action: https://github.com/crazy-max/docker-metadata-action/tree/annotations-alt#annotations. See outputs docs: https://github.com/crazy-max/docker-metadata-action/tree/annotations-alt#outputs

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