For even smaller images that are always deterministic/reproducible with a multi-party signed supply chain, check out https://stagex.tools
I always like finding people advocating for older sage knowledge and bringing it forward for new audiences. That said, as someone who wrote a book about Docker and has lived the full container journey I tend to skip the containerized build all together. Docker makes for great packaging. But containerizing ever step of the build process or even just doing it in one big container is a bit extra. Positioning it as a build scripting solution was silly.
I've seen so many devs not know that things like multi stage even exists.
Multi gigabyte containers everywhere.