dotcloud/docker-registry — pull request #150 by samalba (2013-12-10 02:09:28+00:00)
Title: Added support for environment variable default value

Added support for default env value in the config

For example:

```yaml
prod:
secret_key: _env:REGISTRY_SECRET_KEY:foobar_secret
```

Basically, if the environment variable REGISTRY_SECRET_KEY does not exist, it'll be equal to "foobar_secret".

It will deprecate the script setup-configs.sh