Implement support for schema 2 manifests

data/registry_model/registry_pre_oci_model.py

@@ -27,6 +27,10 @@ class PreOCIModel(SharedModel, RegistryDataInterface):
   PreOCIModel implements the data model for the registry API using a database schema
   before it was changed to support the OCI specification.
   """
+  def supports_schema2(self, namespace_name):
+    """ Returns whether the implementation of the data interface supports schema 2 format
+        manifests. """
+    return False
 
   def find_matching_tag(self, repository_ref, tag_names):
     """ Finds an alive tag in the repository matching one of the given tag names and returns it