a378c0f913
Add ARG CACHE_BUST boundary in Dockerfile before curl-latest tool installs. Layers above (base image, apt, Chrome) are cached via GHA cache; layers below are rebuilt every build via CACHE_BUST=$GITHUB_SHA. Replaces the blanket no-cache approach that also prevented caching the expensive base image. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>