these 2 derivations will be built:
  /nix/store/dki9arx4gymcqlvwwfwlrf27wwixjw45-nixos-test-driver-pg_jsonschema.drv
  /nix/store/3nlrvqkh9w7qbwgdcp4bxfr9021l5ynd-vm-test-run-pg_jsonschema.drv