drone/docker stuff

.drone.yml

@@ -46,8 +46,9 @@ pipeline:
    registry: docker.infra.flowdat.com
    username: drone
    password: 6hd2dLfL
-   tag: latest
+   tag: 
+     - ${DRONE_TAG##v}
    when:
      event: [pull_request, push, tag]
-     branch: master
+     branch: [master, v*]