Heroku provides a variety of continuous delivery tools to help you deploy effortlessly and safely:
Pipelines make it easy to maintain separate staging and production environments for your app.
Review apps let you try out a GitHub pull request’s changes in an isolated and disposable environment.
Heroku CI automatically runs your app’s test suite on new GitHub pull requests, or when code is merged into your repo’s master branch.
Release phase lets you run tasks (such as database migrations) before a new release is deployed.