Define NixOS tests in `tests/nixos/default.nix` rather than `flake.nix` (cherry picked from commit c29b8ba142a0650d1182ca838ddc1b2d273dcd2a) Change-Id: Ieae1b6476d95024485df7067e008013bc5542039
Ieae1b6476d95024485df7067e008013bc5542039