For test environments this buildpack will compile assets for each environment.
Heroku by default will not precompile assets in your build process if it finds a Manefest file in your repo. That makes sense, right?
However, what if you want to run a test server that tests your latest master branch? Well your options are:
rake assets:precompile. This sucks because if you modify an asset twice before deploying, you'll now have 2 different compiled assets in your repo (and running
assets:cleantoo often is not a good idea since it breaks some old asset caches).
Copy the snippet above into CLI.