问题描述：升级fedora 33后，使用git clone，git pull，git push等需要与远程publickey进行权限校验时，提示Permission Denied (publickey)

错误原因以及解决方案：

Fedora 33移除了sha1 加密算法，但是在发布说明中没有提及。所以导致默认生成的publickey类型与远程服务器端不一致，解决办法：

添加配置文件：~/.ssh/config，声明同远程仓库进行校验时使用的密钥类型，内容如下：

Host code.aliyun.com
User git
PubkeyAcceptedKeyTypes ssh-rsa

根据个人情况进行修改，参考资料如下：

The Fedora 33 removes SHA1, which will certainly be in the release notes [1]. But it did not mention ssh at all yet, but we are going to fix it.
There is a simple workaround by using ECDSA authentication and host keys (which use SHA2 ever since) or creating a following configuration snippet to connect to legacy hosts:
  # legacy host not supporting RSA with SHA2
  Host server.name.here:
    PubkeyAcceptedKeyTypes ssh-rsa
I will keep the bug open until we will make sure the release notes are  fixed.
[1] https://fedoraproject.org/wiki/Releases/33/ChangeSet#Strong_crypto_settings:_phase_2