The runner mounts a persistent nix-store volume over /nix, and the nixos/nix image makes /etc/nix/nix.conf a symlink into /nix/store. When the volume and image versions differ, the link dangles and appending to it fails before checkout. That broke asxpio and datacenterbingo CI on 2026-10-18. Pass the settings in NIX_CONFIG instead, with build-users-group empty and the sandbox off as the image config has them. Assisted-by: Claude:opus-5-5 |
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