fix redis config

compose.yml

@@ -16,7 +16,7 @@ services:
       - VIKUNJA_DATABASE_DATABASE=vikunja
       - VIKUNJA_SERVICE_JWTSECRET_FILE=/run/secrets/jwt_secret
       - VIKUNJA_REDIS_ENABLED=1
-      - VIKUNJA_REDIS_HOST='redis:6379'
+      - VIKUNJA_REDIS_HOST='${STACK_NAME}_redis:6379'
       - VIKUNJA_CACHE_ENABLED=1
       - VIKUNJA_CACHE_TYPE=redis
     volumes: 
@@ -51,6 +51,10 @@ services:
     image: redis
     networks:
       - internal
+    deploy:
+      labels:
+        - "traefik.http.services.${STACK_NAME}.loadbalancer.server.port=80"
+
 
   db:
     image: postgres:13