these 3 derivations will be built:
  /nix/store/1fhms2p5gnx2ijv9caqizny0wcc70zcs-herdr-core-0.1.21.drv
  /nix/store/2x9hn4drpdsjp3kmyk6qkiwryg0xgnqj-herdr-app-0.1.15.drv
  /nix/store/8ys9xizh4ca585wacsl1w01kbpz3x9ih-check-herdr-app.drv
building '/nix/store/1fhms2p5gnx2ijv9caqizny0wcc70zcs-herdr-core-0.1.21.drv' on 'grpc://farm.numtide.com:50051?connect-timeout=20&restart-grace=900&system=aarch64-darwin&token-file=/run/nix-farm-client/farm-token'
building '/nix/store/1fhms2p5gnx2ijv9caqizny0wcc70zcs-herdr-core-0.1.21.drv' on farm.numtide.com:50051
herdr-core-0.1.21> mac02: building 1fhms2p5gnx2ijv9caqizny0wcc70zcs-herdr-core-0.1.21.drv
building '/nix/store/2x9hn4drpdsjp3kmyk6qkiwryg0xgnqj-herdr-app-0.1.15.drv' on 'grpc://farm.numtide.com:50051?connect-timeout=20&restart-grace=900&system=aarch64-darwin&token-file=/run/nix-farm-client/farm-token'
building '/nix/store/2x9hn4drpdsjp3kmyk6qkiwryg0xgnqj-herdr-app-0.1.15.drv' on farm.numtide.com:50051
herdr-app-0.1.15> mac02: building 2x9hn4drpdsjp3kmyk6qkiwryg0xgnqj-herdr-app-0.1.15.drv
building '/nix/store/8ys9xizh4ca585wacsl1w01kbpz3x9ih-check-herdr-app.drv' on 'grpc://farm.numtide.com:50051?connect-timeout=20&restart-grace=900&system=aarch64-darwin&token-file=/run/nix-farm-client/farm-token'
building '/nix/store/8ys9xizh4ca585wacsl1w01kbpz3x9ih-check-herdr-app.drv' on farm.numtide.com:50051
check-herdr-app> mac02: building 8ys9xizh4ca585wacsl1w01kbpz3x9ih-check-herdr-app.drv