Providing apt with additional configuration parameters

[kagehisa]

I'm building behind a corporate proxy and therefore use apt-cacher-ng with a hard wired mappping for each used repository in order to build my images.
This works fine so far. But for debugging purposes I often need to directly specify the repository in order to rule out any issues that may be introduced by apt-cacher-ng.
For this I used the option to provede a apt configuration file via the boxroot fodler in my build space e.g. boxroot/apt/apt.conf.d/90-aptproxy .
But it seems the apt version used during the build ignores these files completely.

Is there a way to provide additional configuration during the build for apt. Either via the kiwi description itself or with another location in the boxroot folder?

[schaefi]

Thanks for reporting, that proxy stuff also bites us at other places. We should find a proper solution but my plate is currently full with SLE16 tasks. Thus I can't make any promises when I get to it.