Description of problem:

OCI images can't be imported.

Version-Release number of selected component (if applicable):

3.x-4.5

How reproducible:

always

Steps to Reproduce:
1. build an image using podman build --format=oci
2. push it to docker.io or any other registry that supports oci images
3. try to import it using `oc import-image`

Actual results:

error: Import failed (NotFound): dockerimage.image.openshift.io "docker.io/ricardomaraschini/simple-web-server:latest" not found

Expected results:

Successfully imported image.

Additional info:

The actual error from the registry is

{"errors":[{"code":"MANIFEST_UNKNOWN","message":"OCI manifest found, but accept header does not support OCI manifests"}]}

but OpenShift hide it.