feat: add s3 blob handler(by readll all :( )

internal/util/rerr/rerr.go

@@ -53,3 +53,9 @@ var ErrDigestInvalid = &RepositoryError{
 	Code:    "NAME_INVALID",
 	Message: "invalid digest",
 }
+
+var ErrUnauthorized = &RepositoryError{
+	Status:  http.StatusUnauthorized,
+	Code:    "UNAUTHORIZED",
+	Message: "access to the requested resource is not authorized",
+}