php5-fpm.sock specified instead of php7.3-fpm.sock for debian buster
In apps.vhost, /var/run/php5-fpm.sock is set. On Debian Buster, this causes a 502 bad gateway because now PHP version is 7.3. On an upgraded installation this should not cause issue but on a fresh install, php5 is not installed at all. Also the path has changed, the socket is: /var/run/php/php7.3-fpm.sock