Add OCI annotations to images

[mikaello]

In your backend image in the hedgedoc/hedgedoc repository you have used the OCI annotations, these can be used by other tools to enhance the user experience. E.g. Renovate will use the source label to add a link back to where the image is coming from.

It would be nice if these labels were added to the images built in this repository as well.

Currently, there are no labels for the hedgedoc image:

$ docker inspect quay.io/hedgedoc/hedgedoc --format '{{ json .Config.Labels }}'
null

[DerMolly]

This is fixed now and can be closed, can it not @ErikMichelson?

[ErikMichelson]

Nope, this is not fixed for 1.x Docker images.

[Avi98]

@ErikMichelson can i work on this

[DerMolly]

Feel free to do so.