How to Host an Elixir Application on Vertra Cloud

my_app/
├── lib/
│   └── my_app/
│       └── application.ex
├── config/
│   └── runtime.exs
├── mix.exs
├── mix.lock
└── vertracloud.config

MAIN=mix.exs
VERSION=recommended

import Config

if config_env() == :prod do
  port = String.to_integer(System.get_env("PORT") || "80")

  config :my_app, MyAppWeb.Endpoint,
    url: [host: System.fetch_env!("PHX_HOST"), port: 443, scheme: "https"],
    http: [ip: {0, 0, 0, 0}, port: port],
    secret_key_base: System.fetch_env!("SECRET_KEY_BASE"),
    server: true
end

# mix.exs
def application do
  [mod: {MyApp.Application, []}, extra_applications: [:logger]]
end

defp deps do
  [
    {:plug_cowboy, "~> 2.7"}
  ]
end

# lib/my_app/application.ex
defmodule MyApp.Application do
  use Application

  def start(_type, _args) do
    port = String.to_integer(System.get_env("PORT") || "80")

    children = [
      {Plug.Cowboy, scheme: :http, plug: MyApp.Router, options: [ip: {0, 0, 0, 0}, port: port]}
    ]

    Supervisor.start_link(children, strategy: :one_for_one, name: MyApp.Supervisor)
  end
end

# lib/my_app/router.ex
defmodule MyApp.Router do
  use Plug.Router

  plug :match
  plug :dispatch

  get "/" do
    send_resp(conn, 200, ~s({"message":"Elixir on Vertra Cloud"}))
  end

  get "/health" do
    send_resp(conn, 200, ~s({"status":"healthy"}))
  end

  match _ do
    send_resp(conn, 404, "not found")
  end
end