these 6 derivations will be built:
  /nix/store/2w4flpqjalhbby6cbrg0siaif6yxgr5n-nixos-system-server-test.drv
  /nix/store/wdrvr02qgskxd0pq556cwbav5x3sz6q4-closure-info.drv
  /nix/store/7cy0i30wy58r3y4nn7pq0h8argljrqam-run-nixos-vm.drv
  /nix/store/bdcgmfrx4rvbcxhsh693yd2iz06v5nnp-nixos-vm.drv
  /nix/store/vw0pncbg0lj8rxqjfzcwv6k6f59r8mq4-nixos-test-driver-pgrouting.drv
  /nix/store/9ylf5s4r754qrpdsaggmjyr57x5whypr-vm-test-run-pgrouting.drv