升级容器 - 保留配置和数据

[md-misko]

@tschloss

问：如何通过 Docker 升级现有安装？

Manually update Discourse and Docker image to latest

This guide provides step-by-step instructions for manually updating Discourse, the Docker container, and the Ubuntu operating system on a self-hosted setup. Required user level: System Administrator SSH access to the server. If you self-host Discourse, you occasionally need to run a manual update via the command line to get the latest security releases newest libraries. These updates are not picked up in admin/update, which is why you’ll occasiona…