Two methods for building a release
This will run the app using mix (e.g. mix phx.server
)
`docker-compose up`
The image will have access to regular mix tasks like mix ecto.migrate
This will compile a release using distillery
./build_release # builds release_image
`docker-compose -f docker-compose-prod.yml up`
The release image will not have access to mix but tasks can be added to the
elixir release like bin/elixir_release_example migrate