I disagree on the importance you’re putting on what I think are edge cases for most development. When I’m building a binary, the biggest issue I tend to run into is the “machine” I’m building it on. Docker allows that “machine” to have reproducibly equivalent dependencies. Same version of Node, .NET, Java, etc. I don’t see how the kernel really matters that much here. I’ve never once cared what Linux kernel I’m on, but I can’t count the number of times I’ve had to figure which exact version of Cordova I need with Ionic or whatever mess of dependencies I need.
Maybe kinda, but really you'd want reproducible cross-compilation too, so a reproducible build should produce the same binary regardless of which machine it is run on.
"Identical binaries" is not the same thing as "reproducible builds". It's maybe one aspect of one type of CI/CD, but I would say not even the majority.
> A build is reproducible if given the same source code, build environment and build instructions, any party can recreate bit-by-bit identical copies of all specified artifacts.
Just changing the kernel under which the container runs can break havoc on the "reproducible" build.