these 4 derivations will be built:
  /nix/store/v7isqai37m0hra12ma5nq8g5az06n2ab-test-script.drv
  /nix/store/icv6s5474w1dsvq34syqh2crvb99dw8v-driverConfiguration.json.drv
  /nix/store/nwz8rkjnskdy5p2gwmzvxl0b5wq75vk1-nixos-test-driver-iets-cachetest.drv
  /nix/store/h0a6rpb62735hcnih9xmiirdxax7kfc5-container-test-run-iets-cachetest.drv
building '/nix/store/v7isqai37m0hra12ma5nq8g5az06n2ab-test-script.drv'
test-script> structuredAttrs is enabled
building '/nix/store/icv6s5474w1dsvq34syqh2crvb99dw8v-driverConfiguration.json.drv'
driverConfiguration.json> structuredAttrs is enabled