The Zammad 5 docker version is working like a charm but I’m going to recheck zammad compilation once more.
The issue is that the zammad rpm requires the exact postgresql package > 9.4, so rh-postgres* or a docker version are not working.
The docker version already has a working postgresql container, so in case of an update from Zammad 4 we just need to migrate old data from postgresql 9.2 to the container.