these 2 derivations will be built:
  /nix/store/hkn6p17vzj55cw83hznax1r23qkyxpd5-nixos-test-driver-pgrouting.drv
  /nix/store/3bxnqixkwcm5zhmdfqgni7gvqr58z5j1-vm-test-run-pgrouting.drv