Can't run automation on sandbox mode

I try to run external automation app for my elixir/phoenix application but I got error:
could not lookup Ecto repo Automation.Repo because it was not started or it does not exist
my code on the automation app:

setup do
     :ok = Ecto.Adapters.SQL.Sandbox.checkout(Automation.Repo)
     metadata = Phoenix.Ecto.SQL.Sandbox.metadata_for(Automation.Repo, self())|>IO.inspect()
    {:ok, session} = Wallaby.start_session([metadata: metadata, capabilities: %{browserName: "chrome"}])
    %{session: session}
  end

  test "test", session do
    session.session
    |> visit("http://localhost:4000/topics/new")
end

The automation config:

config :automation, Automation.Repo,
  adapter: Ecto.Adapters.Postgres,
  username: "user",
  password: "",
  database: "my_app_dev",
  hostname: "localhost",
  pool: Ecto.Adapters.SQL.Sandbox

In the app code:
On endpoint file:

if Application.get_env(:my_app, :sql_sandbox) do
    plug Phoenix.Ecto.SQL.Sandbox
  end

And on config file:

config :my_app, MyApp.Repo,
  adapter: Ecto.Adapters.Postgres,
  username: "user",
  password: "",
  database: "my_app_dev",
  hostname: "localhost",
  pool_size: 10

  config :my_app, :sql_sandbox, true