Use label instead env, cleanup build (#50)

* Use label instead env, cleanup build

* Update const.py

* fix lint

* add space

* fix lint

* use dynamic type

* fix lint

* fix path

* fix label read

* fix bug

hassio/dock/homeassistant.py

@@ -4,7 +4,6 @@ import logging
 import docker
 
 from . import DockerBase
-from ..tools import get_version_from_env
 
 _LOGGER = logging.getLogger(__name__)
 
@@ -51,8 +50,7 @@ class DockerHomeAssistant(DockerBase):
                         {'bind': '/ssl', 'mode': 'rw'},
                 })
 
-            self.version = get_version_from_env(
-                self.container.attrs['Config']['Env'])
+            self.process_metadata()
 
             _LOGGER.info("Start docker addon %s with version %s",
                          self.image, self.version)