graph_models dot file uses Roboto by default

[Fang Liu]

I'm wonder why the generated dot file defaults to this font. Is it because it's the django admin default?

The problem I'm having with it is I'm switching to an alpine-based docker image from a debian one, and it doesn't come with fonts, so I can't generate a png from it until I installed it.

Would you recommend that I add Roboto to the repo and use it in the build? Downloading the latest font during the build is not so simple anymore since it's not just a simple url to wget.