this derivation will be built:
  /nix/store/ad9vm24j1afljflvpg4880zv3xdjdiah-spec-xmllint.drv
building '/nix/store/ad9vm24j1afljflvpg4880zv3xdjdiah-spec-xmllint.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=21&system=aarch64-linux'
building '/nix/store/ad9vm24j1afljflvpg4880zv3xdjdiah-spec-xmllint.drv' on farm.numtide.com:50051
spec-xmllint> elastic-arm-234f8218: building ad9vm24j1afljflvpg4880zv3xdjdiah-spec-xmllint.drv
spec-xmllint> invalid/a.xml:2: parser error : Premature end of data in tag b line 1
spec-xmllint> 
spec-xmllint> ^
spec-xmllint> invalid/a.xml:2: parser error : Premature end of data in tag b line 1
spec-xmllint> 
spec-xmllint> ^

upload niks3: ok