Can you try this docker image ? https://hub.docker.com/r/kasmweb/redroid/ you do not need Kasm you can use this command :
sudo docker run --rm -it --shm-size=512m -p 6901:6901 -e VNC_PW=password kasmweb/redroid:1.16.0
For me I have an error about binder not loaded.
Thanks for the plugin, I installed it succesfully, but I still don't have binder :
root@turboserver03:~# lsmod | grep ashmem
ashmem_linux 16384 0
root@turboserver03:~# lsmod | grep binder
root@turboserver03:~# modprobe binder_linux
modprobe: FATAL: Module binder_linux not found in directory /lib/modules/6.12.23-Unraid
Redroid is still not starting :/