在使用 Github Action 自动化部署博客时，需要用到密钥来登录服务器，在这里记录一下具体步骤和其中踩过的一些坑
生成密钥对
在 root/.ssh目录中生成公私钥
[root@CentOSAli ~]# ssh-keygen
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa):
Created directory '/root/.ssh'.
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /root/.ssh/id_rsa.
Your public key has been saved in /root/.ssh/id_rsa.pub.
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