these 2 derivations will be built:
  /nix/store/16pb5hsllp0kdrc4jm9ynkz60djmcx1k-nixos-test-driver-pg_jsonschema.drv
  /nix/store/lm642dyrp3j3m64vzhy05n4wab7pmskh-vm-test-run-pg_jsonschema.drv