fix version marshalling

docker/docker.go

@@ -258,7 +258,7 @@ func GetLatestContainerInfo(containerType string) (map[string]string, error) {
 	if err != nil {
 		return res, err
 	}
-	containerData, ok := channel[containerType].(map[string]interface{})
+	containerData, ok := m[containerType].(map[string]interface{})
 	if !ok {
 		return nil, fmt.Errorf("%s data is not a map", containerType)
 	}