Add Redis Channel Layer for the drawing system

Signed-off-by: Emmy D'Anello <emmy.danello@animath.fr>

tfjm/settings_prod.py

@@ -30,3 +30,12 @@ CSRF_COOKIE_SECURE = False
 CSRF_COOKIE_HTTPONLY = False
 X_FRAME_OPTIONS = 'DENY'
 SESSION_COOKIE_AGE = 60 * 60 * 3
+
+CHANNEL_LAYERS = {
+    "default": {
+        "BACKEND": "channels_redis.core.RedisChannelLayer",
+        "CONFIG": {
+            "hosts": [(os.getenv('REDIS_SERVER_HOST', 'localhost'), os.getenv('REDIS_SERVER_PORT', 6379))],
+        },
+    },
+}