Ooooh, “it will always overwrite.”: this is like saying an indirect way of saying that your executable will behave exactly the same if it got overwritten (by a same set of bytes).
I’ve read bug threads in the moby GitHub where they reject a feature because it’s not repeatable, while people point out that Docker files start with apt-get so they aren’t repeatable from layer 2 anyway. The team members don’t seem to hear them and it’s frustrating to watch.
Images are repeatable. We like repeatable images. That’s enough for most of us. Don’t break that and we’re good. Just fix build time bullshit please.
Even of your image pins apt or yum, images you depend on likely don't.
Docker is repeatable, not reproducible.