these 2 derivations will be built:
  /nix/store/hqvyvfmcgacgnmmzbmw9xg82hz1p4bnz-nixos-test-driver-pg_jsonschema.drv
  /nix/store/mm03ralp1ir54vxw11y0lb0rcr4wiipx-vm-test-run-pg_jsonschema.drv