these 2 derivations will be built:
  /nix/store/fb5gyrk9wvw6sgxfhz80vsmljq3606p6-nixos-test-driver-pg_jsonschema.drv
  /nix/store/rlm03nr6h0jx248rhizvy8jwwmf9sgaj-vm-test-run-pg_jsonschema.drv