No debug output in docker image

### Prerequisites - [x] I have [searched](https://github.com/roundcube/roundcubemail/issues?q=is%3Aissue) for duplicate or closed issues - [x] I can recreate the issue with all plugins disabled ### Describe the issue I have the latest docker image and I'm having trouble sending emails via SMTP. Trying to figure out what I've done wrong. I don't see anything obvious as the settings are the same as in Thunderbird. So I've tried to enable smtp_debug and other logging. However, whatever I do, I can't get any logs out of it. In /var/roundcube/config/config-extra.ini.php I've added: $config['imap_debug'] = true; $config['smtp_debug'] = true; Not a beep. So looking at defaults.ini.php, I've added the following to make sure it's going to the right place: $config['log_dir'] = '/var/www/html/logs/'; $config['log_driver'] = 'file'; Making sure /var/www/htmo/logs has the right permissions and owner/group. Again not a beep. Nothing on console. Is this a bug or has debugging been disable in docker image? ### What browser(s) are you seeing the problem on? Firefox ### What version of PHP are you using? latest ### What version of Roundcube are you using? latest ### JavaScript errors None ### PHP errors None