this derivation will be built:
  /nix/store/b5pl9x9lq6smcfz3nr3dz4i9kk5994nr-check-herdr.drv
building '/nix/store/b5pl9x9lq6smcfz3nr3dz4i9kk5994nr-check-herdr.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-linux'
building '/nix/store/b5pl9x9lq6smcfz3nr3dz4i9kk5994nr-check-herdr.drv' on farm.numtide.com:50051
check-herdr> bld4: building b5pl9x9lq6smcfz3nr3dz4i9kk5994nr-check-herdr.drv

upload niks3: ok