The release page (https://github.com/wxMaxima-developers/docker-wxmaxima/releases) has AppImage files for some older releases, but the most recent AppImage is for wxMaxima-22.09.0-5, and there is no AppImage in any later release.
Looks like AppImage missing in releases has been a problem in the past (#6). I don't know if the problem at present is the same is the recurrence of the previous problem, or a different problem.