We're very excited to release our Dockerfile Explorer that allows you to introspect the low-level build (LLB) steps that a Dockerfile transforms into. It's great for visualizing what each step in your Dockerfile is doing at a file system level and how different aspects of your build impact the LLB operations and, ultimately, the Docker layers produced during a build.

If you're interested in how we built it and how it works, we have a detailed blog post that goes into the details.