these 6 derivations will be built:
  /nix/store/dq3lgknyaczab0vbf37n0dyymy111w4i-nixos-system-server-test.drv
  /nix/store/qb2h1bvmzw3y5qrz6y54d17qryw7yy4d-closure-info.drv
  /nix/store/wwl8ya9x92s6z7mawz0jbrb0ydjjhqk8-run-nixos-vm.drv
  /nix/store/w8af3rjvxyraq9y3wyx7jv26s95qn12q-nixos-vm.drv
  /nix/store/kldcg10dl1gsmjpkzf9ab9nqm9yr9mrr-nixos-test-driver-plpgsql_check.drv
  /nix/store/ija1g3mp5ndp66ifdgkx5vf3qykfnxhv-vm-test-run-plpgsql_check.drv