server url fix (#4378)

cli/cmd/docker/auth.go

@@ -114,7 +114,7 @@ func (a *AuthGetter) GetGARCredentials(ctx context.Context, serverURL string, pr
 		return "", "", err
 	}
 
-	serverURL = parsedURL.Host + "/" + strings.Split(parsedURL.Path, "/")[0]
+	serverURL = parsedURL.String()
 
 	var token string