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Garry Tan
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Both build attempts of `.github/docker/Dockerfile.ci` failed at `apt-get update` with persistent connection timeouts to archive.ubuntu.com:80 and security.ubuntu.com:80 — 90+ seconds of "connection timed out" against every Ubuntu IP. Not a transient blip; this PR doesn't touch the Dockerfile, and a re-run reproduced the same failure across all 9 mirror IPs. Root cause: Ubicloud runners (Hetzner FSN1-DC21 per runner output) have unreliable HTTP-port-80 routing to Ubuntu's official archive endpoints. Fix: - Rewrite /etc/apt/sources.list.d/ubuntu.sources (deb822 format in 24.04) to use https://mirror.hetzner.com/ubuntu/packages instead. Hetzner's mirror is publicly accessible from any cloud (not Hetzner-only despite the name) and route-local for Ubicloud's actual host. Solves both reliability and latency. - Add a 3-attempt retry loop around both `apt-get update` calls as belt-and-suspenders. Even Hetzner's mirror can have brief blips, and the retry costs nothing when the first attempt succeeds. Verification: the workflow will rebuild on push. Local `docker build` not practical for a 12-step image with bun + claude + playwright deps + a 10-min cold install. Trusting CI. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>