builder: pin the nixos/nix base image by digest#156
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The builder Dockerfile defaulted AGENTIX_BUILDER_BASE to the floating nixos/nix:latest tag. That tag moved between the last green master run and today, and the new image's nix binary segfaults immediately under qemu-user x86_64 emulation on arm64 hosts (exit 139 in bundle-build.sh step 1), deterministically failing the 'build e2e (linux/arm64 to linux/amd64)' matrix cell for every PR. The three non-emulated / arm64-emulated cells still pass, which localizes the fault to the image-under-qemu combination rather than any repo change. Pin the default to the digest the last green master run resolved (sha256:bf1d9388...). The ARG stays overridable for testing newer images; bundle builds also become reproducible instead of tracking a moving tag. Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
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The floating
nixos/nix:latesttag moved since the last green master run (Jul 4:sha256:bf1d9388…; today:sha256:377d4887…), and the new image's nix binary segfaults immediately under qemu-user x86_64 emulation on arm64 hosts:This deterministically fails the
build e2e (linux/arm64 to linux/amd64)matrix cell for every PR (reproduced twice on #155, identical failure point; the other three cells pass, localizing the fault to image×qemu rather than any repo change).Pin the
AGENTIX_BUILDER_BASEdefault to the digest the last green master run resolved. The ARG stays overridable via--build-argfor testing newer images, and bundle builds become reproducible instead of tracking a moving tag.🤖 Generated with Claude Code