this derivation will be built:
  /nix/store/1c9a3ri806bndmi1lz9kc34i7884vdcz-check-sub2api.drv
building '/nix/store/1c9a3ri806bndmi1lz9kc34i7884vdcz-check-sub2api.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=23&system=aarch64-linux'
building '/nix/store/1c9a3ri806bndmi1lz9kc34i7884vdcz-check-sub2api.drv' on farm.numtide.com:50051
check-sub2api> bld4: building 1c9a3ri806bndmi1lz9kc34i7884vdcz-check-sub2api.drv

upload niks3: ok