Stage 1 to support multiple domains

.env.sample

@@ -1,6 +1,8 @@
 TYPE=mailman3
 
 DOMAIN=mailman3.example.com
+#EXTRA_DOMAINS=', `www.mailman3.example.com`'
+
 LETS_ENCRYPT_ENV=production
 
 SERVE_FROM_DOMAIN=${DOMAIN}

compose.yml

@@ -98,7 +98,7 @@ services:
       labels:
         - "traefik.enable=true"
         - "traefik.http.services.${STACK_NAME}.loadbalancer.server.port=80"
-        - "traefik.http.routers.${STACK_NAME}.rule=Host(`${DOMAIN}`)"
+        - "traefik.http.routers.${STACK_NAME}.rule=Host(`${DOMAIN}`${EXTRA_DOMAINS})"
         - "traefik.http.routers.${STACK_NAME}.entrypoints=web-secure"
         - "traefik.http.routers.${STACK_NAME}.tls.certresolver=${LETS_ENCRYPT_ENV}"
         - "coop-cloud.${STACK_NAME}.version=0.1.0+1.21.1"