these 2 derivations will be built:
  /nix/store/mrlcq6w4hd4agy54flqnlrmdj0pm9rp0-nixos-test-driver-pg_repack.drv
  /nix/store/0kp9wrmy3gnv8alpv6zadc7q86b5zvcv-vm-test-run-pg_repack.drv