these 2 derivations will be built:
  /nix/store/rmyjqzc3wq84xjs3jqyz8f560gr8c32v-nixos-test-driver-pg_repack.drv
  /nix/store/i5hv0as7mqjpibn6akhyk01w1l9asmg2-vm-test-run-pg_repack.drv