vaccins/config/runtime.exs

import Config
alias Config.Helper

# config/runtime.exs is executed for all environments, including
# during releases. It is executed after compilation and before the
# system starts, so it typically used load production configuration
# and secrets from environment variables or elsewhere. Do not define
# any compile-time configuration in here, as it won't be applied.
# The block below contains prod specific runtime configuration.
if config_env() == :prod do
  env =
    Helper.load_all([
      "SECRET_KEY_BASE",
      "PORT",
      "HOST"
    ])

  config :vaccins, VaccinsWeb.Endpoint,
    secret_key_base: env.secret_key_base,
    url: [host: env.host, port: env.port],
    http: [
      port: String.to_integer(env.port),
      net: :inet,
      transport_options: [socket_opts: [:inet6]]
    ],
    server: true
end