When I run the following command:
heroku run rake assets:precompile
My css, javascripts and anything in the root of my public folder is precompiled...however, my image folder (which is in the public folder) is not precompiled.
How can I ensure that my public folder is precompiled (I want them to be on my cdn, per the steps here...https://devcenter.heroku.com/articles/cdn-asset-host-rails31)?
Assets in public are not precompiled. If your assets need precompiling, put them in app/assets (and or adjust your config settings to look in other places).
From Ruby on Rails Asset Pipeline Guide::
Assets can still be placed in the public hierarchy. Any assets under public will be served as static files by the application or web server. You should use app/assets for files that must undergo some pre-processing before they are served.
