

Read-only, or the ability to edit filenames & upload files?
Read only: as per other answers here, basically any HTTP server. The easiest one I know would be darkhttpd, because it requires no config files and can be run without root.
Read write: I like WFM https://github.com/tenox7/wfm
I’ve had the opposite experience. When I declared something I was taken to the front of the queue. My travelling partner declared nothing and I had to wait half an hour for them to catch up to me.
Might depend on exactly how they’re running the queues that day? Not sure. This was terminating in Sydney too, not layover, so they might use a different location, equipment and/or staff.