如何建立 SSH 連線在 GitHub 上面

部署 React 時，遇到了這個錯誤訊息：

> git push -u origin master Permission denied (publickey). fatal: Could not read from remote repository.

Please make sure you have the correct access rights and the repository exists.

必須要先設定 SSH 連線才可以，參考官方文件

Generating a new SSH key and adding it to the ssh-agent

Connecting to GitHub with SSH

Checking for existing SSH keys

找到 Add new SSH keys 加上去就完成了。