nixosTests: fix pure eval by setting system to null (#404284)

+3
nixos/tests/boot.nix
···
iso =
(import ../lib/eval-config.nix {
modules = [
../modules/installer/cd-dvd/installation-cd-minimal.nix
../modules/testing/test-instrumentation.nix
···
sd =
(import ../lib/eval-config.nix {
modules = [
../modules/installer/sd-card/sd-image-x86_64.nix
../modules/testing/test-instrumentation.nix
···
let
config =
(import ../lib/eval-config.nix {
modules = [
../modules/installer/netboot/netboot.nix
../modules/testing/test-instrumentation.nix
···
iso =
(import ../lib/eval-config.nix {
+
system = null;
modules = [
../modules/installer/cd-dvd/installation-cd-minimal.nix
../modules/testing/test-instrumentation.nix
···
sd =
(import ../lib/eval-config.nix {
+
system = null;
modules = [
../modules/installer/sd-card/sd-image-x86_64.nix
../modules/testing/test-instrumentation.nix
···
let
config =
(import ../lib/eval-config.nix {
+
system = null;
modules = [
../modules/installer/netboot/netboot.nix
../modules/testing/test-instrumentation.nix
+1
nixos/tests/ec2.nix
···
let
imageCfg =
(import ../lib/eval-config.nix {
modules = [
../maintainers/scripts/ec2/amazon-image.nix
../modules/testing/test-instrumentation.nix
···
let
imageCfg =
(import ../lib/eval-config.nix {
+
system = null;
modules = [
../maintainers/scripts/ec2/amazon-image.nix
../modules/testing/test-instrumentation.nix
+1
nixos/tests/image-contents.nix
···
let
config =
(import ../lib/eval-config.nix {
modules = [
../modules/testing/test-instrumentation.nix
../modules/profiles/qemu-guest.nix
···
let
config =
(import ../lib/eval-config.nix {
+
system = null;
modules = [
../modules/testing/test-instrumentation.nix
../modules/profiles/qemu-guest.nix
+1
nixos/tests/openstack-image.nix
···
let
image =
(import ../lib/eval-config.nix {
modules = [
../maintainers/scripts/openstack/openstack-image.nix
../modules/testing/test-instrumentation.nix
···
let
image =
(import ../lib/eval-config.nix {
+
system = null;
modules = [
../maintainers/scripts/openstack/openstack-image.nix
../modules/testing/test-instrumentation.nix
+1
nixos/tests/systemd-machinectl.nix
···
containerSystem =
(import ../lib/eval-config.nix {
modules = [ container ];
}).config.system.build.toplevel;
···
containerSystem =
(import ../lib/eval-config.nix {
+
system = null;
modules = [ container ];
}).config.system.build.toplevel;