oci/archive/oci_dest.go
func (d *ociArchiveImageDestination) SupportsSignatures(ctx context.Context) error {
	return d.unpackedDest.SupportsSignatures(ctx)
}
func (d *ociArchiveImageDestination) SupportsSignatures(ctx context.Context) error {
	return d.unpackedDest.SupportsSignatures(ctx)
}
// SupportsSignatures returns an error (to be displayed to the user) if the destination certainly can't store signatures