these 2 derivations will be built:
  /nix/store/9bjpr1vzdbnmw1a20m0ims3nh825yxxd-nixos-test-driver-pg_jsonschema.drv
  /nix/store/q56mivx5i0dmnrmmg2973ynd7278j0k4-vm-test-run-pg_jsonschema.drv