add REDIRECT_DOMAIN

.env.sample

@@ -7,6 +7,7 @@ DOMAIN=vikunja.example.com
 
 ## Domain aliases
 #EXTRA_DOMAINS=', `www.vikunja.example.com`'
+#REDIRECT_DOMAIN=www.vikunja.example.com
 
 LETS_ENCRYPT_ENV=production
 

compose.yml

@@ -50,12 +50,14 @@ services:
       - source: healthcheck
         target: /healthcheck
         mode: 555
-
     deploy:
       labels:
         - "traefik.enable=true"
         - "traefik.http.services.${STACK_NAME}.loadbalancer.server.port=3456"
         - "traefik.http.routers.${STACK_NAME}.rule=Host(`${DOMAIN}`${EXTRA_DOMAINS})"
+        - "traefik.http.routers.${STACK_NAME}.middlewares=${STACK_NAME}-redirect-aliases@docker"
+        - "traefik.http.middlewares.${STACK_NAME}-redirect-aliases.redirectregex.regex=^https://${REDIRECT_DOMAIN:-example.com}(.*)"
+        - "traefik.http.middlewares.${STACK_NAME}-redirect-aliases.redirectregex.replacement=https://${DOMAIN}$${1}"
         - "traefik.http.routers.${STACK_NAME}.entrypoints=web-secure"
         - "traefik.http.routers.${STACK_NAME}.tls.certresolver=${LETS_ENCRYPT_ENV}"
         - "coop-cloud.${STACK_NAME}.version=1.0.3+0.24.2"