Elixir-docker is a set of is a set of Docker images meant to serve as good bases for Elixir. It uses stepsaway/baseimage-docker as it base image and builds & installs Elixir from source.
Each major version of Elixir has its own image and the patch level changes are included in the tag.
The tags for Elixir-docker include the patch level for the major Elixir version, followed by the version of stepsaway/baseimage-docker which Elixir-docker uses for its base image. For example, Elixir 1.5.1 on stepsaway/baseimage:1.0.2 would be: stepsaway/baseimage-elixir15:1-2.0.1