fix redis configuration

src/paperless/settings.py

@@ -160,7 +160,7 @@ CHANNEL_LAYERS = {
     "default": {
         "BACKEND": "channels_redis.core.RedisChannelLayer",
         "CONFIG": {
-            "hosts": ["redis://localhost:6379"],
+            "hosts": [os.getenv("PAPERLESS_REDIS", "redis://localhost:6379")],
         },
     },
 }