问题
mc: Unable to update the server. We encountered an internal error, please try again. (Server update failed, please do not restart the servers yet: failed with Incompatible signature algorithm).
解决方法
禁用MINIO_UPDATE_MINISIGN_PUBKEY 或者设置为空，跳过校验
参考资料
https://github.com/minio/minio/issues/13824
https://github.com/minio/selfupdate