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/hrsizfrkdzn00fdygnlr9khvm9ihfhpi-nixos-test-driver-pgrouting.drv
  /nix/store/h6x9bxvaz0wrkbwkgnn6gvn84k7qqzd3-vm-test-run-pgrouting.drv