In general, in Go, Java, and Python I've resorted to copying in the Gopkg files, pom.xml, and requirements.txt, and then running the requisite dependency instal

In general, in Go, Java, and Python I've resorted to copying in the Gopkg files, pom.xml, and requirements.txt, and then running the requisite dependency installer for the language (dep, pip, mvn, etc...) and then just copying in the rest of the repo, relying on the .dockeringore with a default-ignore for everything and specifying the individual files/directories you may want to add, and in some cases a rootfs folder when necessary. This seems to be the happy medium for me. I don't have very strong opinions on requirements.txt always being the pinned output from a pip freeze, and it seems like pipenv may actually die in a few years, and poetry will evolve to take the mantle, but I do lots of things with conda anyway.