Dockerfile: add label-schema and OCI labels

[bertsky]

perhaps better this way. But I have no idea how org.opencontainers.image.base.digest is supposed to be set within Dockerfile (short of another BUILD_ARG), so I just left it out.

[bertsky]

Before you merge, can we trigger GHA here and take a look at the labels, comparing before/after?

[markusweigelt]

Before you merge, can we trigger GHA here and take a look at the labels, comparing before/after?

Yes I have created an image to test labels.

https://github.com/slub/ocrd_controller/pkgs/container/ocrd_controller/90000776?tag=labeltest

[bertsky]

Yes I have created an image to test labels.

https://github.com/slub/ocrd_controller/pkgs/container/ocrd_controller/90000776?tag=labeltest

That's odd. GH does not show any. docker image inspect does show all the OCI labels under Config, but there's also a null under ContainerConfig – no idea what relevance that has.

[markusweigelt]

That's odd. GH does not show any. docker image inspect does show all the OCI labels under Config, but there's also a null under ContainerConfig – no idea what relevance that has.

My internet is so lame i am still downloading :/