these 2 derivations will be built:
  /nix/store/2qpzgj9dsn1ya9m7ibsnzdb5qck6acfw-grok-1.0.70.drv
  /nix/store/bz6mb3z5cs08mqs7zwy7568qgr3zjz5a-check-grok.drv
building '/nix/store/bz6mb3z5cs08mqs7zwy7568qgr3zjz5a-check-grok.drv' on 'grpc://farm.numtide.com:50051?connect-timeout=23&system=aarch64-darwin&token-file=/run/nix-farm-client/farm-token'
building '/nix/store/bz6mb3z5cs08mqs7zwy7568qgr3zjz5a-check-grok.drv' on farm.numtide.com:50051
check-grok> mac02: building bz6mb3z5cs08mqs7zwy7568qgr3zjz5a-check-grok.drv