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- Add `# syntax=docker/dockerfile:1` to enable BuildKit cache mounts - Replace `--no-cache-dir` pip installs with `--mount=type=cache,target=/root/.cache/pip` so torch/CUDA wheels are reused across builds instead of re-downloaded every run - Add `docker system prune -f` step before build to free dangling image/layer space - Add `cache-from`/`cache-to` pointing to `:cache` tag so unchanged layers (including the heavy voice-deps layer) are pulled from registry instead of rebuilt Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>