these 6 derivations will be built:
  /nix/store/cfc570fklav9783zw4x8skc390dn0jdz-iets-0.1.0.drv
  /nix/store/zmppsp6y4jlchs54nax41qb69kv1jm9l-closure-info.drv
  /nix/store/6ypscjbv1w51binr3z92prm3fz3rqvkv-test-script.drv
  /nix/store/62pgp545f8znj6c5cw1pa84h6mdavm2k-driverConfiguration.json.drv
  /nix/store/3ndbwhqhkwkd24mk1d2d8z5nyh54m3rp-nixos-test-driver-iets-cachetest.drv
  /nix/store/bajl5qdmj2kpfwh576hq6z10whrbf5za-container-test-run-iets-cachetest.drv