github不允许同一个ssh key用在不同的github账户（仓库）上

解决方法：

使用github的http验证方式进行push。

 

参考资料：

https://help.github.com/articles/which-remote-url-should-i-use/#cloning-with-https-urls-recommended

https://stackoverflow.com/questions/13225826/using-the-same-deploy-key-for-multiple-github-projects