these 6 derivations will be built:
  /nix/store/mjphrpkvpfxx0xzys3rdp0bq9l0irkvg-nixos-system-server-test.drv
  /nix/store/x9a9hvhaz6z66v5yzn299xisknga4a2c-closure-info.drv
  /nix/store/9yydjj9ncf60mgh3jvvqp6gfvafi3q4l-run-nixos-vm.drv
  /nix/store/b8jlrlam21jkb1kapvwzzyh78fgshqb1-nixos-vm.drv
  /nix/store/ag9khqi9p91zrz57l6z76mdd3qqvk14s-nixos-test-driver-pgrouting.drv
  /nix/store/hi3g0s3djvlwibj14z373h1z1s2x5z0p-vm-test-run-pgrouting.drv