these 2 derivations will be built:
  /nix/store/1rcl7vxmz1sdm449qph34rgzd6vl56bk-nixos-test-driver-pg_jsonschema.drv
  /nix/store/qm82ibhf87q544wq0rkbcdql2c61xdgv-vm-test-run-pg_jsonschema.drv