artifact: do not set SystemContext in CopyOptions

We set it not nil anyway so it is not used and it is already removed
from common:
544c8fc8cf

Signed-off-by: Paul Holzinger <pholzing@redhat.com>

pkg/domain/infra/abi/artifact.go

@@ -162,7 +162,6 @@ func (ir *ImageEngine) ArtifactPush(ctx context.Context, name string, opts entit
 	}
 
 	copyOpts := libimage.CopyOptions{
-		SystemContext:                    nil,
 		SourceLookupReferenceFunc:        nil,
 		DestinationLookupReferenceFunc:   nil,
 		CompressionFormat:                nil,