参考 http://www.sail.name/2018/12/16/ssh-config-of-mac/
有一点注意 Host 的名字和 HostName改为一致. 因为从git仓库复制的地址是全程.
Host code.aliyun.com HostName code.aliyun.com User git PreferredAuthentications publickey IdentityFile ~/.ssh/id_rsa_aliyuncode
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