因為 2021/08/13 後，github 不給用 https 加密碼方式連線，
只能用 ssh key 的方式。
但是照著步驟一直失敗
Pushing to ssh://github.com/myname/project.git
myname@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.
