I think I'll resume my project, something that monitors the emacs repository and builds-push docker images to the docker hub when necessary.
It'll contain images for 24.3+ and latest master.

For information, https://hub.docker.com/r/silex/emacs/ is up & running.

Offered images are 24.3, 24.4, 24.5, 25.1 and master branch.

I plan on adding `*-rc1` images, allowing people to test early.

Philippe