these 2 derivations will be built:
  /nix/store/lilzafzlx2nkbv1b5bjdqbqljh16m03b-nixos-test-driver-pg_repack.drv
  /nix/store/msxvl97j1z97lhsiywbm9rpzx24w2vq8-vm-test-run-pg_repack.drv