hercules-ci-agent 0.3.1

Changed

• Emit a log when evaluator starts to push to cachix

• Increase attribute limit to 50k

• Pin nixpkgs commit and speed up compilation via https://hercules-ci.cachix.org

Fixed

• Possible exception during evaluation was not propagated,
  resulting into lack of retries

• #8: Refresh agent session on cluster join token change

• Fix segfault on involved IFD project (remove a finalizer)

• Cachix: fix a crash with a lot of attributes (when determining closure graph)