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How Blacksmith used Tailscale Services to work around ISP degradation

TL;DR: We built a transparent proxy that routes GitHub traffic through an alternate network path with direct GitHub peering, giving our runners defence-in-depth against ISP routing failures. No code changes required for customers—GitHub Actions interact with GitHub exactly as they used to. This proxy uses the newly announced Tailscale Services for secure load balancing and Squid for high-performance proxying and caching.