Change effective on 28 March 2018
Release phase enables you to run tasks before a new release is deployed to production (e.g., sending CSS/JS/assets to a CDN, priming cache stores, or running database schema migrations).
To define a release phase command, specify a
release section with a
command in your heroku.yml:
build: ... release: command: - rake db:migrate run: web: bundle exec puma -C config/puma.rb
If you’ve defined a Dockerfile build, you can also specify the Docker image to use to execute the command:
build: docker: web: Dockerfile worker: worker/Dockerfile release: image: worker command: - ./deployment-tasks.sh
Learn more about heroku.yml.