these 2 derivations will be built:
  /nix/store/zni4qkkl8rx0iiw8s7yxahhz7k5ak9rg-nixos-test-driver-pg_repack.drv
  /nix/store/6p6m608h8wzqnra5i4pvydgrpvcpah44-vm-test-run-pg_repack.drv