Upsun Environment API
On Upsun, an environment encompasses a single instance of your entire application stack, the services used by the application, the application's data storage, and the environment's backups. In general, an environment represents a single branch or merge request in the Git repository backing a project. It is a virtual cluster of read-only application and service containers with read-write mounts for application and service data. On Upsun, the default branch is your production environment—thus, merging changes to this branch will put those changes to production.