Não www para www sem erro de certificado

[JammyDodger]

Segui este conselho e adicionei uma linha ao meu app.yml:

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…

Embora eu não me importe se as pessoas me encontrarem no domínio raiz ou no subdomínio www, então eu não tentei com redirecionamentos.