Older versions of the MWDumper docpage had this note:
Current WMF builds are produced by jenkins. For the latest version check the jenkins build. You can find a mostly up-to-date build at https://integration.wikimedia.org/ci/view/Java/job/mwdumper-maven/
Obviously this has not been the case for a long time, but it would be nice to have it. Apparently there's a dockerfile for building it automatically, so might not be too hard to build on that...