How can I configure a Docker container to use a custom pip.conf file?
This does not (seem to) work for me:
from python:3.9
COPY pip.conf ~/.config/pip/pip.conf
where pip.conf is a copy of the pip configuration that points to a proprietary package repository.
The problem is the ~ expansion. This is a shell feature, and it's not working in a Dockerfile.
Just define like this, using the dest path explicitly:
from python:3.9
COPY pip.conf /root/.config/pip/pip.conf
If you want to use something other than /root/.config then consider to add a WORKDIR instruction and specify paths relative to that.