Comment by pss314

John Howard (one of the maintainers of Istio and currently with Solo.io) blogged about "Fast GitHub Actions with Blacksmith" [1]. The blog also contains a link to "GitHub Action Runner Alternatives" [2].

[1]: https://blog.howardjohn.info/posts/blacksmith-gha/

[2]: https://binhong.me/blog/github-action-runner-alternatives/