this derivation will be built:
  /nix/store/p7ph3hicb09a68q6snc0aqp3vgyq483h-check-hol-guard.drv
building '/nix/store/p7ph3hicb09a68q6snc0aqp3vgyq483h-check-hol-guard.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/p7ph3hicb09a68q6snc0aqp3vgyq483h-check-hol-guard.drv' on farm.numtide.com:50051
check-hol-guard> bld4: building p7ph3hicb09a68q6snc0aqp3vgyq483h-check-hol-guard.drv

upload niks3: ok