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I'm trying to create a small footprint docker image to run a python app that uses GPIO and camera. Everything works fine when using FROM raspbian/stretch as the base image in my Dockerfile.

If I understand correctly, I should be able to use the much smaller base images from https://hub.docker.com/r/arm32v7/python/ but I'm having issues with performing apt-get install libraspberrypi-bin (in the Dockerfile)

I think I just need to add the following to sources.list:

deb http://archive.raspberrypi.org/debian/ stretch main

but then I come up against GPG errors. So I've tried to apt-get install gnupg first, but now I get Package 'gnupg' has no installation candidate.

Maybe there is a different base image to use, or maybe the 'raspbian/stretch' base image is as small as it gets (but I doubt it)?

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