this derivation will be built:
  /nix/store/cny5wmf3xwg19v05gn93w7fk4pk663km-interpolate-conformance.drv
building '/nix/store/cny5wmf3xwg19v05gn93w7fk4pk663km-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-linux'
warning: cny5wmf3xwg19v05gn93w7fk4pk663km-interpolate-conformance.drv: no connected, non-draining worker for system 'aarch64-linux' offers features {}, the workers offer {}, waiting up to 120s for a worker
cny5wmf3xwg19v05gn93w7fk4pk663km-interpolate-conformance.drv: no connected, non-draining worker for system 'aarch64-linux' offers features {}, the workers offer {}
error: build of '/nix/store/cny5wmf3xwg19v05gn93w7fk4pk663km-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-linux' failed: no connected, non-draining worker for system 'aarch64-linux' offers features {}, the workers offer {}
error: Cannot build '/nix/store/cny5wmf3xwg19v05gn93w7fk4pk663km-interpolate-conformance.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/kkn8b6vywm0by9ysfs6crfqpsrnz4ws2-interpolate-conformance