阿里云code的一个小坑：他们的SSH只支持ssh-rsa算法：

Unable to negotiate with 198.18.0.27 port 22: no matching host key type found. Their offer: ssh-rsa
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.

解决方法：

Host code.aliyun.com
  AddKeysToAgent yes
  HostkeyAlgorithms +ssh-rsa
  IdentityFile ~/.ssh/id_ed25519