Automatically add standard oci annotations for base images

[meier-christoph]

Environment:

• Jib version: 0.12.0
• Build tool: jib-cli
• OS: linux

Description of the issue:

There are 2 standard annotations for base images defined by the oci image-spec. It would be nice if jib-cli could add those automatically since the tools should have all the requried informations during the build.

Other build tools like podman/buildah already add those annotations by default.

https://github.com/opencontainers/image-spec/blob/main/annotations.md#pre-defined-annotation-keys

Expected behavior:

jib-cli should add these 2 annotations automatically :

• org.opencontainers.image.base.digest
• org.opencontainers.image.base.name