So it's not that easy after all. Ubuntu changed compression inside deb files to zst, which is not (yet?) supported by Debian tools (https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=892664). As a result I can't publish using existing tools (we run Debian for that). I will take another look at the problem later.
DEBs temporary available here: https://netxms.org/tmp/impish/
