This one contains resources related to the deployment of Elixir apps using releases. It's a very basic approach but should be good as a start point.

• Dockerfile - multi-stage Dockerfile that produces super light image (app stage based on Alpine linux)
• config.exs - config read on at build time
• runtime.exs - runtime config
• release.ex - to run custom commands in production (e.g. migrations)

• functions defined in release.ex can be invoked via eval or rpc commands (e.g. ./bin/my_app rpc MyApp.Release.migrate)
• use runtime config to configure app via environment variables
• use System.fetch_env! in runtime config to fail fast when some ENVs are missing

• https://elixir-lang.org/getting-started/mix-otp/config-and-releases.html
• https://hexdocs.pm/mix/1.12/Mix.Tasks.Release.html
• https://hexdocs.pm/phoenix/releases.html