[uf00lme]

I did something similar w/VMware nearly 8-10 years ago, just separate storage from OS in your thinking and automate provisioning as needed.

It’s possible to do something similar with ec2 but if you want speed then move your build farm on-prem to utilise storage provider technologies eg https://tintri.com/blog/. Portworx+Stork would probably get you most of the way if you went down the k8 route but not something I’ve seen or look at in detail.

In my experience if your OS boot time is your main bottle neck then you are likely over optimising before expanding your testing environments. Fun but not the best use of development time, it is easier to have a minimum amount of system online before they are needed and just attach new storage to them as needed.