iOS安装ruby homebrew

直接用国内镜像，国外的基本上不行,一句命令搞定，国内的镜像地址

/bin/zsh -c "$(curl -fsSL [https://gitee.com/cunkai/HomebrewCN/raw/master/Homebrew.sh](https://gitee.com/cunkai/HomebrewCN/raw/master/Homebrew.sh))"