This image is based on my
alpine-erlang image, which contains a (mostly) full Erlang installation (some things, such as
jinterface are not included). Out of the box Elixir, Hex, and Rebar are installed and ready to use. The bare minimum of build tooling required to compile dependencies is installed, but you may need to add additional things depending on your application.
If you need additional system dependencies (other than the bare necessities, like OpenSSL), it is expected that your Dockerfile will expand on this image and install those things you need. I try to limit the things installed in this image to keep the base image small.