these 2 derivations will be built:
  /nix/store/1kj8wplwspzpl6iixjacqrxd5yw5vdlr-nixos-test-driver-flakelet-relay.drv
  /nix/store/3vfz72vix6a171zp4bqp9cx1qmbq9i31-container-test-run-flakelet-relay.drv