these 6 derivations will be built:
  /nix/store/jjifj728r0shswpxaisqd766mzbpf95d-nixos-system-server-test.drv
  /nix/store/jxyfa42nvfd2q53rz1x47zvxna0bcwbs-closure-info.drv
  /nix/store/d4iqgjsrhl8058l9v49jz8qhcqgkc00s-run-nixos-vm.drv
  /nix/store/7kqawdw9f92564dn229czmiy0jba221d-nixos-vm.drv
  /nix/store/fbbmw7m6nly28f0x6nrhwbn3wpha0c3r-nixos-test-driver-index_advisor.drv
  /nix/store/nh2qy3a8rjhix74fk5lgkgjnrnrdkgmz-vm-test-run-index_advisor.drv