these 2 derivations will be built:
  /nix/store/39xfk9bb0dvdi8vqfkpmimxcw4ihlcjv-nixos-test-driver-pgrouting.drv
  /nix/store/zas047ijarm6rys3zag0y9mavfvdpnn5-vm-test-run-pgrouting.drv