these 2 derivations will be built:
  /nix/store/6zmbh44zwsrmnp185d0h6g9kgv5b63pd-nixos-test-driver-pg_jsonschema.drv
  /nix/store/hbmh4san58r5pxcgah5ydqhlw0i80326-vm-test-run-pg_jsonschema.drv