https://cloudron.io/ looks like a relevant target for GNU Social, pump.io, Diaspora etc. I see no social network software on there now, except Ghost and Wordpress. Porting is less involved than Sandstorm, mostly just a Docker container.
 

Found it via the sad news that Sandstorm failed their enterprise business model. The project lives on!

https://news.ycombinator.com/item?id=13582942 is the HN discussion of https://sandstorm.io/news/2017-02-06-sandstorm-returning-to-community-roots.