Wow. When yuzu was taken down I wrote a script to automatically download the 5 latest releases of a few other emulators I use, and that included Ryujinx (so I do have the binaries for those, which will go into safekeeping).
Now I wish I had set up a Gitea mirror as well, even though I would likely never build it myself.
Edit: here's the script - https://gist.github.com/rcarmo/89afd64747fc909e80b29abc902c8...
It is designed to be very low impact (I had it on a daily cron).
Feel free to use it to ensure you can preserve the software you rely on. As far as I'm concerned, I'm _very_ sad that Nintendo has now made it impossible to enjoy my games on better hardware, and will probably focus on PC gaming henceforth (there are lots of nice indie games on Steam, like Dredge, which is my current favorite).
Here's Ryujinx new website, final releases archived and latest builds available for download - https://ryujinx-emulator.com
Do forks go away together with the original repository when it's removed from Github?
I actually do have a private gitea mirror setup after the yuzu takedown.
There is a backup from 15/09 on https://archive.softwareheritage.org/