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We ran actions runners ourselves in kubernetes at previous jobs, and at least back then, a lot of the errors came from the github services simply not telling the runners to handle jobs. So in general it didn't matter how much compute you had, they never got scheduled jobs.
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ARC protects you from most common kind of Actions incident as seen over last month: GitHub's runner pool running short. Nothing CI-based can protect from an outage in the Actions service itself.
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Yep. Proxmox, Kubernetes, ARC, and t3 code threads spawned inside of kata containers is my current workflow.
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