these 2 derivations will be built:
  /nix/store/rlvsqld4az6cvyp051q1xsin3xajqsy5-nixos-test-driver-pg_jsonschema.drv
  /nix/store/797qgzbzvf6dbv5fa2z2xxw2k842nklv-vm-test-run-pg_jsonschema.drv