Image rebase and improved remote cache support in new BuildKit We’ve just shipped new versions of the BuildKit builder engine, Dockerfile 1.4 frontend, and Docker Buildx CLI. Each of these comes with many new features. In this blog post, I’ll show one of them, a new copy mode in Dockerfiles, and explain why you should start to use it on your Dockerfiles. With the Dockerfile 1.4 release, the COPY a