this derivation will be built:
  /nix/store/l1x9m71lp1wmckylzcka7f5q2nzd5hmn-interpolate-conformance.drv
building '/nix/store/l1x9m71lp1wmckylzcka7f5q2nzd5hmn-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=23&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/l1x9m71lp1wmckylzcka7f5q2nzd5hmn-interpolate-conformance.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/pjs1k2rhrdrb7s3xznis2cir4vkcpvxc-interpolate-conformance


nixbot: transient error detected, retrying once

this derivation will be built:
  /nix/store/l1x9m71lp1wmckylzcka7f5q2nzd5hmn-interpolate-conformance.drv
building '/nix/store/l1x9m71lp1wmckylzcka7f5q2nzd5hmn-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/l1x9m71lp1wmckylzcka7f5q2nzd5hmn-interpolate-conformance.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/pjs1k2rhrdrb7s3xznis2cir4vkcpvxc-interpolate-conformance