these 2 derivations will be built:
  /nix/store/jfq0bppyy4zwrpz3bj8xg80rsy7kk671-nixos-test-driver-pg_jsonschema.drv
  /nix/store/drp3743kim1ci2gw0gj7q7pyv4q26g3h-vm-test-run-pg_jsonschema.drv