inventory tests: use containers by default

lib/test/container-test-driver/nixos-module.nix

@@ -0,0 +1,26 @@
+{ pkgs, lib, ... }:
+{
+  boot.isContainer = true;
+
+  # needed since nixpkgs 7fb2f407c01b017737eafc26b065d7f56434a992 removed the getty unit by default
+  console.enable = true;
+
+  # undo qemu stuff
+  system.build.initialRamdisk = "";
+  virtualisation.sharedDirectories = lib.mkForce { };
+  networking.useDHCP = false;
+
+  # We use networkd to assign static ip addresses
+  networking.useNetworkd = true;
+  services.resolved.enable = false;
+
+  # Rename the host0 interface to eth0 to match what we expect in VM tests.
+  system.activationScripts.renameInterface = ''
+    ${pkgs.iproute2}/bin/ip link set dev host0 name eth1
+  '';
+
+  systemd.services.backdoor.enable = false;
+
+  # we don't have permission to set cpu scheduler in our container
+  systemd.services.nix-daemon.serviceConfig.CPUSchedulingPolicy = lib.mkForce "";
+}