these 2 derivations will be built:
  /nix/store/7snx8s1mwbjlj3qb2g4k6r4qzzwclqm8-nixos-test-driver-pgrouting.drv
  /nix/store/qikgwn7ryrjaxgik15hs0yrgam04ncps-vm-test-run-pgrouting.drv