Release failed: no match of right hand side value: {:error, :eacces}

### Steps to reproduce
```
$ mix phx.new --no-ecto phoenix_distillery
$ cd phoenix_distillery

# mix.exs
defp deps do
[ ...,
{:distillery, "~> 2.0"},
...,
]
end

$ mix deps.get --only prod
$ MIX_ENV=prod mix compile
$ npm run deploy --prefix assets
$ mix phx.digest

$ mix distillery.init

$ MIX_ENV=prod mix distillery.release
```

Just a brief list of the steps required to produce the issue.

### Verbose Logs

Paste the output of the release command you ran with the `--verbose` flag
below in the summary tags (this helps keep the issue easy to navigate):

```
Generated phoenix_distillery app
==> Assembling release..
==> Building release phoenix_distillery:0.1.0 using environment prod
==> Including ERTS 13.1.4 from /opt/homebrew/Cellar/erlang/25.2.2/lib/erlang/erts-13.1.4
==> Release failed: no match of right hand side value: {:error, :eacces}
```