this derivation will be built:
  /nix/store/hnbz6prnj825klfivbahdl114qqkjzyy-interpolate-conformance.drv
building '/nix/store/hnbz6prnj825klfivbahdl114qqkjzyy-interpolate-conformance.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=22&system=aarch64-linux'
building '/nix/store/hnbz6prnj825klfivbahdl114qqkjzyy-interpolate-conformance.drv' on farm.numtide.com:50051
interpolate-conformance> elastic-arm-97cbd869: building hnbz6prnj825klfivbahdl114qqkjzyy-interpolate-conformance.drv
interpolate-conformance> 10 cases: Nix interpolate == Python interpolate == expected
could not copy /nix/store/pjfsi25rkw3z61fva5ndh1wnr31bm2nz-interpolate-conformance: error: gRPC FetchNars failed: failed to connect to all addresses; last error: UNKNOWN: ipv4:65.21.215.17:50051: tcp handshaker shutdown
error: some outputs are unexpectedly invalid