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You should probably be selling that if it works well. That is something I have not seen.

Bakevm with tooling > create userdata script for cloud init to copy payload to server > create systemd oneshot service to run payload && shutdown

You should try it! Our baking interface looks more like Docker than a traditional VM provision (ala Packer)

Also, we keep the baked images around for a week and trigger them whenever they are requested (with, say, HTTP, or terminal access)

I may be misunderstanding the product, but it seems to be able to run a webserver on each "server".