Registry
A Registry is a set of stored credentials for a private Docker registry that can be referenced during a Build.
Adding Registries
$ convox registries add registry.example.org user password
Adding registry... OK
Use https://index.docker.io/v1/
for DockerHub.
Listing Registries
$ convox registries
SERVER USERNAME
registry.example.org user
Deleting Registries
$ convox registries remove registry.example.org
Removing registry... OK