git 配置ssh时，出现主机验证失败的问题

The authenticity of host ‘github.com (52.74.223.119)’ can’t be established.
RSA key fingerprint is SHA256:nThbg6kXUpJWGl7E1IGOCspRomTxdCARLviKw6E5SY8.
Are you sure you want to continue connecting (yes/no)?
Host key verification failed.

然后 .ssh 目录里将是三个文件 . 这样再连的时候就没事