This project implements a mumble-server using the LinuxServer.io base image. If you're interested in running a mumble-server on a NAS, this is what you want.
This project has been deprecated in favor of quay.io/jzelinskie/murmur, which is Alpine Linux based and much smaller.
sudo docker run -d \
-p 64738:64738 \
-p 64738:64738/udp \
-e PGID=100 \
--restart always \
--name mumble \
-v /volume1/docker/mumble-config:/data:rw \
quay.io/jzelinskie/linuxserver-mumble