Adjust log channel of CI tests

Author: samuelwei

.env.ci

@@ -16,7 +16,7 @@ CONTAINER_IMAGE=pilos/pilos:latest
 
 # Log to docker logs
 # If logging to file is needed change to 'stack' or 'daily' and mount the log directory ('storage/logs') to the host
-LOG_CHANNEL=stderr
+LOG_CHANNEL=stack
 # Log level: debug, info, notice, warning, error, critical, alert, emergency
 LOG_LEVEL=debug