Tip for GitHub Runners Concurrency
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I created SWC, an open-source compiler project, and previously worked at Deno and Vercel. These days, I spend a lot of time building Labor0, along with Watchtower and The AI Platform at Zephyr Cloud IO.
The number of concurrent GitHub Action runners is determined by the plan of the GitHub Org to which the repository belongs, regardless of whether the repository is public. Even though GitHub Actions are unlimited and free for public repositories, they are still affected. Because of this, SWC uses the Enterprise plan.
If you're running a large open-source project and are having issues with GitHub Actions only running 20 jobs at a time, you can upgrade your plan to Team or Enterprise.