flatpak_create_oci should return per platform metadata for images
flatpak_create_oci should return per platform
metadata for images

Just add OSBS2 TBD for now. It will be added
when updating the `flatpak_create_oci` plugin.

This helps `tag_and_push` to push images
using skopeo

* CLOUDBLD-9030

Signed-off-by: Harsh Modi <10511c7e5917154b560827e1a03cf4f47a4f7efa@redhat.com>

fr34k8/atomic-reactor,projectatomic/atomic-reactor,projectatomic/atomic-reactor,fr34k8/atomic-reactor