feat(controller) default tags

src/managing-workflow/tuning-component-settings.md

@@ -49,6 +49,7 @@ DEIS_DEPLOY_HOOK_URLS                           | a comma-separated list of URLs
 DEIS_DEPLOY_HOOK_SECRET_KEY                     | a private key used to compute the HMAC signature for deploy hooks.
 DEIS_DEPLOY_REJECT_IF_PROCFILE_MISSING          | rejects a deploy if the previous build had a Procfile but the current deploy is missing it. A 409 is thrown in the API. Prevents accidental process types removal. (default: "false", allowed values: "true", "false")
 DEIS_DEPLOY_PROCFILE_MISSING_REMOVE             | when turned on (default) any missing process type in a Procfile compared to the previous deploy is removed. When set to false will allow an empty Procfile to go through without removing missing process types, note that new images, configs and so on will get updated on all proc types.  (default: "true", allowed values: "true", "false")
+DEIS_DEFAULT_CONFIG_TAGS                        | set tags for all applications by default, for example: '{"role": "worker"}'. (defalut: '')
 KUBERNETES_NAMESPACE_DEFAULT_QUOTA_SPEC         | set resource quota to application namespace by setting [ResourceQuota](http://kubernetes.io/docs/admin/resourcequota/) spec, for example: `{"spec":{"hard":{"pods":"10"}}}`, restrict app owner to spawn more then 10 pods (default: "", no quota will be applied to namespace)
 
 ### LDAP authentication settings