Hey folks, I was thrilled by viewtopic.php?f=49&t=67266, but rather disappointed by how much effort it was to set up, so I built my own version.
https://github.com/andyleap/hnh-map/
It's doing a very similar thing, but is a bit easier to install, as it's available as a completely ready to run docker image, or you can build it yourself with just docker.
If you have any problems getting it working, I've got a discord channel set up: https://discord.gg/Ph4NhUq so feel free to hop in and ask me.
Some features I've added:
Authenticated (somewhat) map uploads: uses a unique token per user as part of the url to upload from the client, so someone would have to guess an existing token to be able to upload bad data.
More users: Have multiple users, with variable "read map", "upload", or "admin" privileges.