A subversion fixture based on Alpine, which creates a default repo, "repo" and allows anonymous write access.
docker run -p 3690:3690 tobyc/subversion
svn checkout svn://localhost/repo
If you want to make the repository permanent, run it like this:
mkdir /srv/svn
docker run -p 3690:3690 -v /srv/svn:/svn tobyc/subversion