these 3 derivations will be built:
  /nix/store/rh353imlr7j1phy6ld8631gcw2znbj14-herdr-core-0.1.21-vendor.drv
  /nix/store/cfr1fd5kxkd2q1pp0xwdy1qi9n9miz8b-herdr-core-0.1.21.drv
  /nix/store/nxma0xdwvdh0r83n8in8lbqsj02kzyw2-check-herdr-core.drv
building '/nix/store/nxma0xdwvdh0r83n8in8lbqsj02kzyw2-check-herdr-core.drv' on 'grpc://farm.numtide.com:50051?connect-timeout=22&restart-grace=900&system=aarch64-darwin&token-file=/run/nix-farm-client/farm-token'
building '/nix/store/nxma0xdwvdh0r83n8in8lbqsj02kzyw2-check-herdr-core.drv' on farm.numtide.com:50051
check-herdr-core> mac02: building nxma0xdwvdh0r83n8in8lbqsj02kzyw2-check-herdr-core.drv