this derivation will be built:
  /nix/store/xn6b7vkn6ndgv7s0lyapyr6xis3akkji-instance-eval.drv
building '/nix/store/xn6b7vkn6ndgv7s0lyapyr6xis3akkji-instance-eval.drv' on 'grpc://farm.numtide.com:50051?connect-timeout=20&system=aarch64-linux&token-file=/run/nix-farm-client/farm-token'
building '/nix/store/xn6b7vkn6ndgv7s0lyapyr6xis3akkji-instance-eval.drv' on farm.numtide.com:50051
instance-eval> elastic-arm-23d67df9: building xn6b7vkn6ndgv7s0lyapyr6xis3akkji-instance-eval.drv
instance-eval> structuredAttrs is enabled