these 2 derivations will be built:
  /nix/store/v22mcgq0fhrgb19d7y4j2yfh8mq5n88z-nixos-test-driver-pg_jsonschema.drv
  /nix/store/s9qxszyg9szd80xdvs68i9wn494gb0q8-vm-test-run-pg_jsonschema.drv