Wrong exception raised by K8s.Resource.from_file!/2

[mruoss]

When called passing a path to an inexistent file, K8s.Resource.from_file!/2 raises an UndefinedFunctionError instead of the expected File.Error:

iex> Kubernetes.Resource.from_file!("inexistent", [])
** (UndefinedFunctionError) function :enoent.exception/1 is undefined (module :enoent is not available)
    :enoent.exception([])
    (k8s 1.1.0) lib/k8s/resource.ex:146: K8s.Resource.from_file!/2

Reason: File.read/2 returns {:error, :enoent}

---

A failing test would look like this:

  describe "from_file!/2" do
    test "not found" do
      assert_raise File.Error, fn ->
        Kubernetes.Resource.from_file!("not_found.yaml", [])
      end
    end
  end