these 6 derivations will be built:
  /nix/store/1nkry5cx8d9p5zpqa727gifdi7wfs7gx-nixos-system-server-test.drv
  /nix/store/702gng3rmpy00z87a4ckaz2xkd69vqbg-closure-info.drv
  /nix/store/r878ybrfcacd2xlhlhyfnlyp0f17y3n5-run-nixos-vm.drv
  /nix/store/07336133k3lywc51bda2ag4drai7vw26-nixos-vm.drv
  /nix/store/jqjqcrw78cxbhc5k396lc63wxsgrnsgq-nixos-test-driver-wrappers-regression-PSQL-1387.drv
  /nix/store/affk6f0k383ks7fh5bxd9i89iyg05aip-vm-test-run-wrappers-regression-PSQL-1387.drv