Provide List of Architecures, OSes, and Variants

[qJake]

File: engine/reference/commandline/manifest_annotate.md

There should be a list of valid OSes, architectures, and variants on this page. It is not intuitive to someone new to manifests which values to use for which parameters. For example, if I have an armv7/armhf image, what would I put for the variant - armv7 or v7 or arm32v7...?

This code is a good starting point, but doesn't list valid variants: https://github.com/docker/cli/blob/1f6a1a438c4ae426e446f17848114e58072af2bb/cli/command/manifest/util.go#L22

[docker-robott]

There hasn't been any activity on this issue for a long time.
If the problem is still relevant, mark the issue as fresh with a /remove-lifecycle stale comment.
If not, this issue will be closed in 14 days. This helps our maintainers focus on the active issues.

Prevent issues from auto-closing with a /lifecycle frozen comment.

/lifecycle stale

[qJake]

/remove-lifecycle stale

[docker-robott]

There hasn't been any activity on this issue for a long time.
If the problem is still relevant, mark the issue as fresh with a /remove-lifecycle stale comment.
If not, this issue will be closed in 14 days. This helps our maintainers focus on the active issues.

Prevent issues from auto-closing with a /lifecycle frozen comment.

/lifecycle stale

[qJake]

/lifecycle frozen

[qJake]

/remove-lifecycle stale