make channels container externally available

compose.yml

@@ -133,10 +133,22 @@ services:
     image: loomio/loomio_channel_server
     networks:
       - backend
+      - proxy
     depends_on:
       - redis
     environment:
       <<: *redis-env
+      VIRTUAL_HOST: channels.${DOMAIN}
+    deploy:
+      labels:
+        - "traefik.enable=true"
+        - "traefik.docker.network=proxy"
+        - "traefik.http.routers.channels${STACK_NAME}.rule=Host(`channels.${DOMAIN}`)"
+        - "traefik.http.routers.channels${STACK_NAME}.tls=true"
+        - "traefik.http.routers.channels${STACK_NAME}.tls.certresolver=${LETS_ENCRYPT_ENV}"
+        - "traefik.http.services.channels${STACK_NAME}.loadbalancer.server.port=5000"
+        - "traefik.http.routers.channels${STACK_NAME}.entrypoints=web-secure"
+
   cron:
     image: loomio/loomio:v2.25.4
     configs: