these 3 derivations will be built:
  /nix/store/0byqmlskzyr0q44kmsf3dki1f4ig658v-nixos-vm.drv
  /nix/store/djp48bb6wql6lnrwsjjkfh5inqhdgdhj-nixos-test-driver-pgaudit.drv
  /nix/store/r6hhq8rhljvclrndcvz25a84ds246cla-vm-test-run-pgaudit.drv