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Draft: Add feature to support GCP Spot instance provisioning

Josh Keys requested to merge jgkeys/docker-machine:google-driver-provisioning-model into main

⚠ ️NOTE THAT THIS FORK IS MAINTAINED FOR CRITICAL BUG FIXES AFFECTING RUNNING COSTS ONLY. NO OTHER CONTRIBUTIONS WILL BE ACCEPTED. ⚠️

What critical bug this MR is fixing?

Does not fix a critical bug but this does provide the ability for the docker-machine provisioner to build workers using Spot instances from Google. (https://cloud.google.com/spot-vms)

How does this change help reduce cost of usage? What scale of cost reduction is it?

By using spot instances the cost of machines can be reduced by 60%-91%.

In what scenarios is this change usable with GitLab Runner's docker+machine executor?

Add the following to the MachineOptions array "google-provisioning-model=SPOT". Default to STANDARD if the option is not passed.

Edited by Josh Keys

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