Comment by ratrocket

On digital ocean (at least) you can upload your own images and boot droplets directly from them.

In the past I've used a script called "alpine-make-vm-image" to run alpine images in digital ocean.

https://github.com/alpinelinux/alpine-make-vm-image

(Maybe that script does some magic to make booting a droplet directly from the image possible. On that I plead ignorance :)