Today I wanted to try to build a snap package, mainly just to see how the process goes really. However I am using Solus so i started to follow build on lxd docker and upon running the image supplied by dockerhub it failed to performs updates and quit.
I believe the docker image just needs rebuilding and uploaded to dockerhub. I was able to successfully build and run the image from the Dockerfile provided in the repo https://github.com/snapcore/snapcraft
As mentioned on irc there should probably be a process of testing whether the current image on dockerhub is working or not, and if not rebuild and upload to dockerhub.
I think its pretty important this get updated quickly as the instructions in the documentation currently do not work.
May also be worth adding a few lines to the documentation describing how to build the image without using dockerhub.