Subversion via an Apache2 server running apache2-webdav in a very small AlpineLinux docker-container.
https://hub.docker.com/r/earthwalksoftware/alpine-svn/.
For details about the scripts, and how to customize the docker image and source, visit
https://github.com/EarthWalkSoftware/alpine-svn/wiki
by Jay Wheeler, EarthWalk Software 2017-08-16.