WIP: add manifest/manifest-descriptor/index annotation levels #6322
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What type of PR is this?
/kind feature
What this PR does / why we need it:
Add (some) annotation levels, where if an annotation name specified to either --annotation or --unsetannotation has a prefix of "manifest", "manifest-descriptor", or "index" (or a comma-separated list of any of them) followed by a colon, we take the annotation name as the part after the colon separator and add (or remove) the annotation from the image manifest (as before), or the image's entry in an image index that we're building (if we're building one), or the image index that we're building (if we're building one).
How to verify it
New integration tests!
Which issue(s) this PR fixes:
None
Special notes for your reviewer:
docker build
also recognizes "index-descriptor", so if we ever get an API for setting it in the top-level index.json when committing directly to an "oci:" or "oci-archive:", we'll want to handle that, too, but that's not available as of now.Does this PR introduce a user-facing change?