these 2 derivations will be built:
  /nix/store/6js9m459dnmn4zjzbypahd1xlph3hqlb-nixos-test-driver-pg_jsonschema.drv
  /nix/store/rki5p2fyagmwv5ksn55ncagbia4i12wy-vm-test-run-pg_jsonschema.drv