Update 2021-05-23: This project is no longer maintained because there is a more clean way of achieving this with only a compose file. Check out my other repo here: SebDanielsson / compose-transmission-wireguard
I just released my first Docker image! It's based on Alpine Linux and runs both WireGuard and Transmission in one container that weights in at about 30 MB. I've customized Transmission to run the excellent Secretmapper / combustion web interface and also applied my SebDanielsson / dark-combustion color palette.