Docker builds, ~/.pip/cache, and O(1) or O(n) bandwidth

What is the best way to build docker images without constantly
re-downloading packages from PyPI (to use ~O(1) bandwidth instead of O(n)
for every build)

(AFAIK, nobody has any issue with the amount of bandwidth PyPI uses)

Thus far, Docker doesn't want to support a build-time -v option (that could
be used to bind-mount .pip/cache in at build time):

"build time only -v option"
https://github.com/moby/moby/issues/14080

Buildah *does* support a build-time -v option (and can also do rootless
builds without a docker socket)

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