Switched nightly version to JDK17 (had to bump certain dependencies thus tigase-projects-parent has version 1.0.5-SNAPSHOT now and any project that wants to use JDK17 should use this version; this also required rebuilding tc-agent because JDK17 wasn't present, which posed another issues…). What's more, I just jlink to create slim version of the Java runtime and create image based on debian bullseye-slim which is only ~187M (compared to 315M from 8.2.0 this is roughly 40% reduction; though, compressed images on dockerhub says 108M vs 121M so the difference is not all that great).

One can use jdeps -s jars/tigase-server.jar to determine required modules for particular jar file.

In future version, when we remove groovy we would probably slash size of the image further (less dependencies and less required modules from the JDK).

I tried building image based on alpine but ran into certain issues and decided it's not worth it.