fix: hardcode OO domain in Traefik label; Coolify does not expand vars in labels

- nextcloud/docker-compose.yml: X-Forwarded-Host=onlyoffice.sherlockhomeless.net
  (was ${OO_DOMAIN} which Coolify leaves unexpanded → OnlyOffice loads assets
  from https://${oo_domain}/ and editor breaks entirely)
- nextcloud/stack.env: update placeholder domains to real ones
- COOLIFY-TEMPLATE.md: add Gotcha 6 about label variable expansion

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

nextcloud/docker-compose.yml

@@ -154,7 +154,7 @@ services:
       - traefik.http.middlewares.oo-secure-headers.headers.contentTypeNosniff=true
 
       - traefik.http.middlewares.oo-forwarded.headers.customRequestHeaders.X-Forwarded-Proto=https
-      - traefik.http.middlewares.oo-forwarded.headers.customRequestHeaders.X-Forwarded-Host=${OO_DOMAIN}
+      - traefik.http.middlewares.oo-forwarded.headers.customRequestHeaders.X-Forwarded-Host=onlyoffice.sherlockhomeless.net
       - traefik.http.middlewares.oo-forwarded.headers.customRequestHeaders.X-Forwarded-Port=443
       - traefik.http.middlewares.oo-forwarded.headers.customRequestHeaders.X-Forwarded-Ssl=on
 

nextcloud/stack.env

@@ -1,6 +1,6 @@
 TZ=Europe/Madrid
-NC_DOMAIN=nextcloud.example.com
-OO_DOMAIN=onlyoffice.example.com
+NC_DOMAIN=nextcloud.sherlockhomeless.net
+OO_DOMAIN=onlyoffice.sherlockhomeless.net
 TRAEFIK_CERTRESOLVER=letsencrypt
 TRUSTED_PROXIES=10.0.0.0/8 172.16.0.0/12 192.168.0.0/16
 MYSQL_ROOT_PASSWORD=change_me_mysql_root_password_long_and_secure
@@ -17,5 +17,5 @@ SMTP_SECURE=tls
 SMTP_AUTHTYPE=
 SMTP_NAME=
 SMTP_PASSWORD=
-MAIL_FROM_ADDRESS=nextcloud
-MAIL_DOMAIN=example.com
+MAIL_FROM_ADDRESS=nextcloud@thehomelesssherlock.com
+MAIL_DOMAIN=thehomelesssherlock.com