Add allowed_content_types to docker-compose.yml

Author: samppanja

docker-compose.yml

@@ -9,4 +9,5 @@ services:
     environment:
       - auth_user=${auth_user}
       - auth_password=${auth_password}
-      - base_url=${base_url}
+      - base_url=${base_url}
+      - allowed_content_types=${allowed_content_types}