these 3 derivations will be built:
  /nix/store/mc4s4npvknchs7sfvkca17ar29sjb5ld-iets-0.2.0.drv
  /nix/store/184afidd57kzd7dpql022si50kial34n-iets-conformance-adapter.drv
  /nix/store/s1cpygaijxknxvlb9lb36s3x6pk3mdj8-nix-conformance-iets.drv
building '/nix/store/mc4s4npvknchs7sfvkca17ar29sjb5ld-iets-0.2.0.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'
warning: mc4s4npvknchs7sfvkca17ar29sjb5ld-iets-0.2.0.drv: no connected, non-draining worker for system 'aarch64-linux' offers features {}, the workers offer {}, waiting up to 120s for a worker
mc4s4npvknchs7sfvkca17ar29sjb5ld-iets-0.2.0.drv: no connected, non-draining worker for system 'aarch64-linux' offers features {}, the workers offer {}
error: build of '/nix/store/mc4s4npvknchs7sfvkca17ar29sjb5ld-iets-0.2.0.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' failed: no connected, non-draining worker for system 'aarch64-linux' offers features {}, the workers offer {}
error: Cannot build '/nix/store/mc4s4npvknchs7sfvkca17ar29sjb5ld-iets-0.2.0.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/y6bynkyar0jq9naxllm444fr27l7rhnc-iets-0.2.0
error: Cannot build '/nix/store/184afidd57kzd7dpql022si50kial34n-iets-conformance-adapter.drv'.
       Reason: 1 dependency failed.
       Output paths:
         /nix/store/x5ily09fp1cd8j5gxf92hcnrm3f7ic0l-iets-conformance-adapter
error: Cannot build '/nix/store/s1cpygaijxknxvlb9lb36s3x6pk3mdj8-nix-conformance-iets.drv'.
       Reason: 1 dependency failed.
       Output paths:
         /nix/store/rpg67bx3azy0gmd9mhv387y1wp1bmscp-nix-conformance-iets