Merge pull request #7050 from Aigeruth/fix/push_image_layer_registry_content_type

Add Content-Type header in PushImageLayerRegistry

registry/registry.go

@@ -656,6 +656,7 @@ func (r *Registry) PushImageLayerRegistry(imgID string, layer io.Reader, registr
 	if err != nil {
 		return "", "", err
 	}
+	req.Header.Add("Content-Type", "application/octet-stream")
 	req.ContentLength = -1
 	req.TransferEncoding = []string{"chunked"}
 	setTokenAuth(req, token)