these 2 derivations will be built:
  /nix/store/4s5v0lfhzihvx1pxs7agwq7gjnnsfbj8-nixos-test-driver-pgrouting.drv
  /nix/store/78zb83w4swfvr7ll53i40bp3br37i9h0-vm-test-run-pgrouting.drv