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Config merging; build environment variables #6
This commit includes two separate but related features:
I'd like some feedback on this, but here's my use case:
I needed libcairo (with development dependencies), which isn't available on heroku. So I put together a buildpack for it, but realized there was no way to pass information from my buildpack into the ruby build pack for installing the "cairo" gem.
So now my cairo buildpack now does this in bin/release:
So that a user can do a multi-build pack with cairo + ruby, do 'gem "cairo"', and everything just works!