heroku-buildpack-elixir
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App environment available in all builds
Source https://devcenter.heroku.com/changelog-items/416
ENV_DIR is a directory that contains a file for each of the application’s configuration variables.
We should read that instead of relying on user defined values that are duplicated. People might forget REDIS_URL or SECRET_KEY_BASE, etc.
Did a take on this https://github.com/HashNuke/heroku-buildpack-elixir/pull/96