these 2 derivations will be built:
  /nix/store/lfwzi1h2w679c9k5kdhv9hvwq1ss6na8-nixos-test-driver-pg_repack.drv
  /nix/store/nvvjxzr7wc51i5vm2xhyw2bp698fji0g-vm-test-run-pg_repack.drv