these 2 derivations will be built:
  /nix/store/zzmkkvffvwg7q5h8rqvkhad4bpgwv52q-nixos-test-driver-pg_jsonschema.drv
  /nix/store/3hnv8nxi0lkrmnnha6g2gdzxmzdac9x2-vm-test-run-pg_jsonschema.drv