this derivation will be built:
  /nix/store/864535kfwg9m2i5d875m4spnpxdw18jg-updater-tests-check.drv
scheduler at farm.numtide.com:50051: no healthy upstream, reconnecting
scheduler at farm.numtide.com:50051: no healthy upstream, reconnecting
scheduler at farm.numtide.com:50051: no healthy upstream, reconnecting