these 2 derivations will be built:
  /nix/store/y5qxjn2mv5pkm5ihz8afjp51hw3vj1kz-nixos-test-driver-pg_jsonschema.drv
  /nix/store/2qi882hsnlcvihkz3yymbdr8rbfwjnhc-vm-test-run-pg_jsonschema.drv