this derivation will be built:
  /nix/store/ss1zqr1faxkplsw71ixqifjyq93ah3cn-interpolate-conformance.drv
building '/nix/store/ss1zqr1faxkplsw71ixqifjyq93ah3cn-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=21&system=aarch64-darwin'
error: gRPC QueryValidPaths on 'farm.numtide.com:50051' failed: error: substituter 'https://cache.numtide.com' is disabled
error: Cannot build '/nix/store/ss1zqr1faxkplsw71ixqifjyq93ah3cn-interpolate-conformance.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/kni2ixkj734p4za99v31z96ybkbi1i8k-interpolate-conformance


nixbot: transient error detected, retrying once

this derivation will be built:
  /nix/store/ss1zqr1faxkplsw71ixqifjyq93ah3cn-interpolate-conformance.drv
building '/nix/store/ss1zqr1faxkplsw71ixqifjyq93ah3cn-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-darwin'
error: gRPC QueryValidPaths on 'farm.numtide.com:50051' failed: error: substituter 'https://cache.numtide.com' is disabled
error: Cannot build '/nix/store/ss1zqr1faxkplsw71ixqifjyq93ah3cn-interpolate-conformance.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/kni2ixkj734p4za99v31z96ybkbi1i8k-interpolate-conformance