this derivation will be built:
  /nix/store/9pxgzd6dkz4cx3gfx5f9dgb7pj7ga1a8-interpolate-conformance.drv
building '/nix/store/9pxgzd6dkz4cx3gfx5f9dgb7pj7ga1a8-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'
building '/nix/store/9pxgzd6dkz4cx3gfx5f9dgb7pj7ga1a8-interpolate-conformance.drv' on farm.numtide.com:50051
interpolate-conformance> elastic-arm-52ccf228: building 9pxgzd6dkz4cx3gfx5f9dgb7pj7ga1a8-interpolate-conformance.drv
interpolate-conformance> 10 cases: Nix interpolate == Python interpolate == expected