this derivation will be built:
  /nix/store/50i1yg64107j34b7lb8nwg0ak4b8zka3-go2nix-nix-plugin-rustfmt.drv
building '/nix/store/50i1yg64107j34b7lb8nwg0ak4b8zka3-go2nix-nix-plugin-rustfmt.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/50i1yg64107j34b7lb8nwg0ak4b8zka3-go2nix-nix-plugin-rustfmt.drv' on farm.numtide.com:50051
go2nix-nix-plugin-rustfmt> mac02: building 50i1yg64107j34b7lb8nwg0ak4b8zka3-go2nix-nix-plugin-rustfmt.drv

upload niks3: ok