Release config with commands

rel_config.exs

use Mix.Releases.Config,
  default_release: :default,
  default_environment: :default

environment :default do
  set dev_mode: false
  set include_erts: false
  set include_src: false
  set cookie: :"this_is_a_secret"
  # Add release commands
  set commands: [
    seed: "rel/commands/seed.sh",
    migrate: "rel/commands/migrate.sh"
  ]
end

release :myapp do
  set version: current_version(:myapp_api)
  set applications: [
    myapp_api: :permanent 
  ]
end