stop container on test exit

lib/ex_unit.ex

@@ -5,6 +5,8 @@ defmodule TestcontainersElixir.ExUnit do
   alias DockerEngineAPI.Api
   alias DockerEngineAPI.Model
 
+  import ExUnit.Callbacks
+
   def container(options \\ []) do
     docker_url = "http+unix://%2Fvar%2Frun%2Fdocker.sock/v1.43"
     conn = Connection.new(base_url: docker_url)
@@ -15,11 +17,19 @@ defmodule TestcontainersElixir.ExUnit do
          {:ok, container} <- simple_container(conn, image, port),
          container_id = container."Id",
          :ok <- reap_container(conn, container_id),
-         {:ok, _} <- Api.Container.container_start(conn, container_id) do
+         {:ok, _} <- Api.Container.container_start(conn, container_id),
+         :ok = on_exit(:stop_container, fn -> stop_container(conn, container_id) end) do
       {:ok, container_id}
     end
   end
 
+  defp stop_container(conn, container_id) when is_binary(container_id) do
+    with {:ok, _} <- Api.Container.container_kill(conn, container_id),
+         {:ok, _} <- Api.Container.container_delete(conn, container_id) do
+      :ok
+    end
+  end
+
   defp simple_container(conn, image, port) when is_binary(image) and is_number(port) do
     Api.Container.container_create(conn, %Model.ContainerCreateRequest{
       Image: image,