Worth being upfront with, I'm an employee, but; Buildkite.

Frontier labs and global saas heavyweights run CI through us, plus a crop of open source tooling like Bazel, vLLM, Firecracker, Rails, Ray, Sorbet and Rust.

Shopify, Uber, Airbnb, Canva stresstested the platform ten years ago for scaling issues.

You need to take a little time to design upfront and take advantage of dynamically programmable primitives. It isn't the same ease/convenience as Actions. Bit more available though.

How would I be able to run my CI via Buildkite when I still host in GitHub and their API is down? We are currently already using self-hosted runners and they also don't work because either they aren't started by GitHub or can't download the code.