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The jessie-dnsutils image build has been failing since Debian Jessie reached end-of-life (EOL) and its repositories were moved to archive.debian.org: W: Failed to fetch http://deb.debian.org/debian/dists/jessie/Release 404 Not Found [IP: 151.101.86.132 80] E: Some index files failed to download. This adds a new glibc-dns-testing image to replace jessie-dnsutils. The new name better reflects the image's purpose: testing glibc DNS resolution behavior (vs. musl in Alpine-based agnhost). The name glibc-dns-testing was recommended by maintainers to reflect that the image's purpose is testing glibc-based DNS resolution, which behaves differently from musl libc (used by Alpine/agnhost). Key differences include: - glibc queries nameservers sequentially; musl queries in parallel - glibc and musl handle ndots and search domains differently - The hostname command behaves differently between glibc and musl Signed-off-by: Davanum Srinivas <davanum@gmail.com>