docker-machine is being deprecated and starts to be unavailable from repositories. It's also not compatible with the latest docker version. See docker-archive-public/docker.machine#4537 and docker/roadmap#245 .
One alternative would be to move towards Terraform. There is a provider for Scaleway, so we wouldn't lose functionality. Is there any interest in moving towards this solution?
What is the problem?
docker-machine being deprecated.
What should be the expected behavior?
Not losing the autoscale!
How can we reproduce this? (What steps did you do to trigger the problem? If applicable, please include multiple screenshots of the problem! Be detailed)
Try installing docker-machine on a recent OS.