these 2 derivations will be built:
  /nix/store/dfr58dfhgsbc0x4ws7r34c50x37ml8r9-nixos-test-driver-pg_repack.drv
  /nix/store/hwsgkfi4r6zhgwbwylaxiwq73x49pvkq-vm-test-run-pg_repack.drv