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CoreDNS was forwarding external queries via its own /etc/resolv.conf, which caused SERVFAIL in systemd-based CI containers due to a broken Docker/host resolver chain. Switch to explicit upstream DNS servers (1.1.1.1, 8.8.8.8) to ensure reliable external name resolution (e.g. pypi.org, google.com) in CI. https://chatgpt.com/share/69837671-6884-800f-8ded-706b35e82bab