Porcelain with destillary

Hello I'm trying to produce a release with **distillery** with goon bundle in the release itself.

Since one can't use `:code.priv_dir(:app)` in config.exs, I tried adding this to my application bootstrap code:

```elixir
Application.put_env(:porcelain, :goon_driver_path, Path.join(:code.priv_dir(:app), 'goon'))
:ok = Porcelain.reinit(:goon)
```

I've checked the correct path is being generated, but porcelain still complains it can't find **goon**.

Any ideas on how to solve this? Or any other strategy for bundling goon in the release itself?