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It spawns ephemeral EC2/Azure instances, which is a lot cheaper than the GitHub actions runners we used before that.

We shard to a lot of machines for tests and I’d be worried about running out if we used dedicated servers.

BuildKite is fine but I wouldn’t be that surprised if we move off of BuildKite to a custom thing at some point. Months ago, we switched from CMake to a handrolled typescript build system and it made our builds faster and simpler.

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Thanks for answering!

I suppose my second question would be how much Bun spends on CI per month atm - I'd imagine that robobun would have ramped up the bill a fair bit

you don't need buildkite or blacksmith anymore.

codex trivially built me a self-hosted gh actions runner workflow for ephemeral vm's (just a big bash script that manages the vms with qemu). i even sped up the builds with my own custom base image with everything installed in it that i need too.

it works flawlessly.

fanning that out to starting and stopping instances wouldn't be too much of a stretch.

Does it work with macOS ?

weird question, i don't see why not. osx has a fantastic virtualization story.

https://developer.apple.com/documentation/virtualization/run...

bro, I was a committer for libvirt

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