[#2845] Add the name of the app being used to the WSGI environ

ckan/config/middleware.py

@@ -342,6 +342,7 @@ def __call__(self, environ, start_response):
                 app_name = 'flask_app'
 
         log.debug('Serving request via {0} app'.format(app_name))
+        environ['ckan.app'] = app_name
         return self.apps[app_name](environ, start_response)