I’ve made a few of Docker images for running Erlang and Elixir on the Raspberry Pi.

• Erlang: https://github.com/joakimk/rpi-erlang
• Elixir: https://github.com/joakimk/rpi-elixir
• The phoenix chat example app: https://github.com/joakimk/rpi-elixir-phoenix-app-example