linuxserver/docker-transmission has supportd multiple UIs, no need for this anymore.
docker image of transmission with transmission-web-control
https://hub.docker.com/r/vaayne/transmission-twc
docker pull vaayne/transmission-twc
Usage for the UI please see https://github.com/ronggang/transmission-web-control/wiki
Usage for the image please see https://github.com/linuxserver/docker-transmission