We tried to set up mediawiki with docker, using the official docker image mediawiki. We uploaded some SVG file into the mediawiki. However, the preview of the image showed an error string instead of the image. It turned out that installing librsvg2-bin fixed the problem.
It would be nice if librsvg2-bin was integrated in the official docker image. If you think it makes the image too large, you should at least explicitly mention in the documentation on Docker Hub that one has to install this package to support SVG.