Provide annotations about service deps in application image

[poikilotherm]

Overview of the Feature Request

To enable tools like https://github.com/gdcc/dataverse-action to automatically choose the right Solr and Postgres versions, we should ship that information within the image (so we don't need to maintain them).
Image annotations are meant to be used for this.

What kind of user is the feature intended for?
Sysadmin, Devs

What inspired the request?
How can we avoid managing and maintaining a list of combinations for Dataverse versions and it's supported/tested service dependencies? (Concrete problem for https://github.com/gdcc/dataverse-action)

What existing behavior do you want changed?
Extend the existing labels with custom ones carrying the backend service's versions as metadata.

Any brand new behavior do you want to add to Dataverse?
Nope

Any open or closed issues related to this feature request?

• Missing upstream functionalities gdcc/dataverse-action#1