Firecracker, with some tiny modifications to better manage memory for the deep nesting of forks
Surely it is reasonable, but also way more than our budget. Id like to compare.
We run our test workload as well as a few other startups' that we have onboarded on one AWS ARM bare-metal machine at $1.7k a month. We don't saturate that machine fully either so I'm not really sure what the amortized cost would be. Certainly more expensive than Github Actions but not by a crazy amount, and the value we get out of it is way higher than GA.