these 2 derivations will be built:
  /nix/store/j9w23a69d0hfqgk9iybj0y4v5s0fs9p2-nickel-wrapper.drv
  /nix/store/c83g5pzk5f970rpw12la1w7vh6cq0yh5-spec-nickel.drv
building '/nix/store/j9w23a69d0hfqgk9iybj0y4v5s0fs9p2-nickel-wrapper.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/j9w23a69d0hfqgk9iybj0y4v5s0fs9p2-nickel-wrapper.drv' on farm.numtide.com:50051
nickel-wrapper> mac02: building j9w23a69d0hfqgk9iybj0y4v5s0fs9p2-nickel-wrapper.drv
nickel-wrapper> structuredAttrs is enabled
building '/nix/store/c83g5pzk5f970rpw12la1w7vh6cq0yh5-spec-nickel.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/c83g5pzk5f970rpw12la1w7vh6cq0yh5-spec-nickel.drv' on farm.numtide.com:50051
spec-nickel> mac02: building c83g5pzk5f970rpw12la1w7vh6cq0yh5-spec-nickel.drv

upload niks3: ok