I took over a Dockerfile that called out to ansible for all the heavy lifting, presumably because that's what the authors knew and liked.

Translating to individual RUN lines removed 100s of lines of code, and vastly sped up the build process. In addition the build process should be more familiar to future Dockerfile devs, who can see the entire build in one file and don't need to learn an extra tool.

Wrt this project, how well does it use Dockers build cache? And is it really better than idiomatic Dockerfile when you account for future developers?