Add environment variable override instructions
Signed-off-by: Richard Scothern <richard.scothern@gmail.com>master
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				|  | @ -9,6 +9,18 @@ You configure a registry server using a YAML file. This page explains the | |||
| configuration options and the values they can take. You'll also find examples of | ||||
| middleware and development environment configurations. | ||||
| 
 | ||||
| ## Overriding configuration options | ||||
| Environment variables may be used to override configuration parameters other than  | ||||
| version.  To override a configuration option, create an environment variable named  | ||||
| REGISTRY\_variable_ where *variable* is the name of the configuration option. | ||||
| 
 | ||||
| e.g  | ||||
| ``` | ||||
| REGISTRY_STORAGE_FILESYSTEM_ROOTDIRECTORY=/tmp/registry/test | ||||
| ``` | ||||
| 
 | ||||
| will set the storage root directory to `/tmp/registry/test` | ||||
| 
 | ||||
| ## List of configuration options | ||||
| 
 | ||||
| This section lists all the registry configuration options. Some options in | ||||
|  |  | |||
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