container builds for services, compiled/packaged components you want to spin up somewhere, often the Dockerfile is very simple, use some base image, add config and your binary or packaged artifact (jars, minified JS etc) and done.

Often the complexity is (or should be) in the shared base not the individual images you build per commit or PR merge.. for those simple images using something like Jib (bazel can do it too..) where it just constructs the image in user land by adding files to the tarball. I imagine this works for arm binaries from x64 too as long as you can cross compile.. how do you feel about these libraries that make simple images waaay more accessible? No docker required.