其实discourse_docker clone到哪个文件夹都可以，都会自动安装到/var/discourse去……
In truth, the location to which one clones the discourse_docker repository is immaterial, as it will invariably be installed automatically to the /var/discourse directory…
理论上不太可能啊，正规操作是编辑app.yml然后rebuild
In theory, it seems rather improbable. The proper procedure would be to modify the app.yml file and subsequently rebuild the application.