Images built with docker-build use baseimage descriptions

[ypcs]

In

actions/docker-build/action.yml

Line 38 in 257781b

--label "org.opencontainers.image.revision=${{ github.sha }}" \

we already set pointer to the git commit from which image was built. However, we don't touch the image description, which currently means that most of our images use default value - "Seravo Ubuntu basebox" as value. This is confusing.

We should add new input to the action, for the description. If easily doable, by default we could just remove the description (when input is empty string), but if it's set, we could use it to override the value we've set previously.