为主站（www.example.com）设置 discourse，而不是在子域上

[JammyDodger]

我还发现这个提示非常有用，可以帮助让 letsencrypt 证书同时适用于 www.example.com 和 example.com 地址。

Set up Let’s Encrypt with multiple domains / redirects

NOTE: @pfaffman says: This page needs to be cleaned up. There is now a new ENV setting that will let you add more hostnames. In your app.yml under your DISCOURSE_HOSTNAME line (it can go many places but that one makes sense), add DISCOURSE_HOSTNAME_ALIASES: domain.com,other.domain.com and early reports suggest that you’ll get valid certs for those domains and that accessing https://domain.com will properly redirect you to your DISCOURSE_HOSTNAME without a certificate error. If you do that an…