CentOS8.1 部署.net core 3.1 环境，涉及 aspnetcore-runtime、防火墙、selinux设置、nginx

#注册微软产品仓库列表 https://packages.microsoft.com/config/centosrpm -Uvh https://packages.microsoft.com/config/centos/8/packages-microsoft-prod.rpm#搜索yum sea