Change effective on 11 September 2017
You can now assign a Heroku Team or an individual as an owner of a Heroku Pipeline. Once set, the Heroku web interface will ask you to assign ownership of all apps in a Pipeline to the owner.
Electing to assign a Pipeline owner, typically a Heroku Team, will prevent common permissions-related issues in collaborative workflows. This is especially important when owners wish to assign team members differing access to production, staging, and development apps.
This feature encourages better structure and administrative hierarchy in Pipelines. Documentation on this effort, including the feature above, is available on the Heroku Dev Center.