- Add Dockerfile.ci-builder (CUDA 12.4 + Rust 1.89 + protoc + sccache + git + lld) - Add prepare stage to build CI builder image via Kaniko (auto on Dockerfile change, manual otherwise) - Replace before_script apt-get installs with pre-baked image in .rust-base - Add git to Dockerfile.service for candle git dependency - Add sccache stats output to check stage