[FEATURE] Annotation support

[lsm5]

trafficstars

Is your feature request related to a problem? Please describe.

I'd like to be able to add annotations to the image instead of labels.

Describe the solution you'd like

Annotation support

Describe alternatives you've considered

Labels

Additional context

I don't see annotations documented in the actions. I tried using the annotations key but skopeo inspect didn't show me anything relevant in the built image.

[lsm5]

cc @cevich

[cevich]

Ref: https://specs.opencontainers.org/image-spec/annotations/?v=v1.0.1