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They share a lot of code. My understanding is that it was an MS project first, but I might have that backwards.

> GitHub Workflows execute on runners. The runner code is essentially a fork of the Azure Pipelines code, so it's very similar. It's also cross-platform and you can also use hosted or self-hosted runners.

https://learn.microsoft.com/en-us/dotnet/architecture/devops...

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Thanks for the link -- I knew that GHA workflow runs ran on Azure, but I didn't know the workflow runner itself was a fork of Azure's runner/instrumentor. That's interesting context!

if you look at the source of the GHA runner, you can see where they regex-replace all references to Azure Pipelines with GitHub Actions lol

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