these 2 derivations will be built:
  /nix/store/vn7s6aaiy84ss4rivjmqngrwxk927vfh-nixos-test-driver-pg_hashids.drv
  /nix/store/2v7nbr69xpsm6jgd66x35sd4mcawr4a2-vm-test-run-pg_hashids.drv