this derivation will be built:
  /nix/store/4q99v17big1bixibzhjhyg9ky7l4zrqm-cargo-fmt-check.drv
building '/nix/store/4q99v17big1bixibzhjhyg9ky7l4zrqm-cargo-fmt-check.drv' on 'grpc://farm.numtide.com:50051?client-cert=/run/secrets/vars/per-machine/bld1/nix-farm-ci/crt&client-key=/run/secrets/vars/per-machine/bld1/nix-farm-ci/key&connect-timeout=20&system=aarch64-darwin'
building '/nix/store/4q99v17big1bixibzhjhyg9ky7l4zrqm-cargo-fmt-check.drv' on farm.numtide.com:50051
cargo-fmt-check> mac02: building 4q99v17big1bixibzhjhyg9ky7l4zrqm-cargo-fmt-check.drv

upload niks3: ok