This buildpack is intended for use after the regular ruby-buildpack.
Heroku's Release Phase (in beta) is their own replacement for this. This project will be deprecated once Release Phase is out of beta and supports all of the use cases.
If you are using the default buildpack, manually set your buildpack to Heroku's default Ruby buildpack
heroku buildpacks:set https://github.com/heroku/heroku-buildpack-ruby
Append the buildpack-ruby-rake-deploy-tasks to your buildpack list:
heroku buildpacks:add https://github.com/gunpowderlabs/buildpack-ruby-rake-deploy-tasks
Configure DEPLOY_TASKS environment variable with the tasks you want to run:
heroku config:set DEPLOY_TASKS='db:migrate cache:clear'
MIT, see the LICENSE file.