我正在尝试使用git bash将我的存储库推送到github，但是我遇到了git push命令的问题。当我输入git push -u origin master时，它会显示我：
The authenticity of host 'github.com (192.30.253.112)' can't be established.
RSA key fingerprint is SHA256:nThbg6kXUpJWGl7E1IGOCspRomTxdCARLviKw6E5SY8.
Are you sure you want to continue connecting (yes/no)?yes
Warning: Permanently added 'github.com,192.30.253.112' (RSA) to the list of known hosts.
git@github.com: Permission denied (publickey).
fatal: Could not read from remote repository.
Please make sure you have the correct access rights and the repository exists.