I have recently received a Synology DS920+ and am moving my openHAB deployment over to that. I went with a Docker installation on the device.
Everything seems to be working well except for the HD Powerview binding. When Installing from the UI it just hangs. Looking at the logs, it is failing for a dependency: org.samba.jcifs/jcifs/1.3.17
I’m glad someone else is seeing this. That should help track down the issue.
I did a search in the addons project on github and jcifs only showed up on 2 bundles. Have you tried removing the hdpowerview binding and see if everything else installs. From your list, I am successfully using openhabcloud, astro, sonos, and zwave bindings.
Clean 3.x build. I ended up manually copying the jcifs jar over from a previous install. It looks like the site that the jars were hosted on was (temporarily?) down. Are you still having an issue?