This has received a lot more testing and might actually work (contrary to the beta 3 builds that were both broken).
The startup sequence has been changed. Instead of blindly trying to start the docker containers (which will fail before they are configured), this now pulls the container image in the background while waiting for the user to set things up.
Also, it pings a backend service to make it easier for people to figure out where in their network their new SBC might be.
To try this out, boot your board with this beta, wait about a minute, and then go to the redirecter
If all goes well, this should take you to the setup page of your new feeder board.
Also, the hostname has changed to adsb-feeder - so if you want to access it via its mDNS name, you need to head to it at http://adsb-feeder.local:5000