[Feature Request]: `docker-machine` is deprecated, we need to add support for another tool for autoscaling about clusterodm HOT 7 OPEN

I've fixed the documentation, Dockerfile and docker-compose files.
This will do for now, but I suggest we keep this open to make sure the tool is not completely abandoned by Gitlab and we keep looking for another solution.

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Ah yes, this is good then!
Maybe we can just update the Readme to point to this new repo, instead of towards https://docs.docker.com/machine/install-machine/ . It was really confusing for me!

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Oh I see, I thought the docker-composer file here was only for the autoscaler (since this was in the autoscaler section of the readme too and there is specific instructions about starting it up with one child nodeodm).
I'll create a separate one and update the readme accordingly.

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A python alternative could be libcloud (I know this tool is written in JS, just mentioning this for posterity): https://libcloud.apache.org/

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Definitely interested in possible approaches to migrate away from docker-machine, although docker-machine is open source, so it continues to receive support from various organizations (e.g. gitlab https://gitlab.com/gitlab-org/ci-cd/docker-machine) and has been working OK thus far, so I don't think we're losing autoscaling anytime soon.

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Thanks. As a heads up, I've reverted the docker-compose file changes since not everyone uses the autoscaling functionality (perhaps those changes should be part of a separate docker-compose file).

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A python alternative could be libcloud (I know this tool is written in JS, just mentioning this for posterity): https://libcloud.apache.org/

@pierotofy Can we not migrate to Terraform? It is very widely supported.

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