these 3 derivations will be built:
  /nix/store/4ycsxayc4xpa28x4l8riq0yk441bhks2-driverConfiguration.json.drv
  /nix/store/vchsl9yivw3ph0h7gmrdq3faa3rlnk9i-nixos-test-driver-nix-grpc-store-acme-substituter.drv
  /nix/store/r9v5jl6r86b7mrz8dww53a44rrm92myi-vm-test-run-nix-grpc-store-acme-substituter.drv