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Implement `ensure_nix_build_group()` and use it in all code paths where Nix is installed as root. This resolves Nix installation failures on Ubuntu containers (root, no systemd) where the installer aborts with: ``` error: the group 'nixbld' specified in 'build-users-group' does not exist ``` The fix standardizes creation of the `nixbld` group and `nixbld1..10` build users across: * container root mode * systemd host daemon installs * root-on-host without systemd (Debian/Ubuntu CI case) This makes Nix initialization deterministic across all test distros and fixes failing Ubuntu E2E runs. https://chatgpt.com/share/693b0e1a-e5d4-800f-8a89-7d91108b0368