Buildx used by default in Docker runtime from January 12th, 2026

In June, we introduced the CC_DOCKER_BUILDX environment variable to let users migrate to Docker Buildx progressively. Starting January 12th, 2026, Docker Buildx will be used as the default builder for all Docker-based applications. If you need to continue using the classic Docker builder, you must set CC_DOCKER_BUILDX=false in your application settings.