Fix debconf warnings in Docker builds #13
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Install apt-utils fixes this warning: "debconf: delaying package configuration, since apt-utils is not installed"
Configure Debian frontent to be non-interactive. Fixes this warning: "debconf: unable to initialize frontend: Dialog" Note: This is not recommended as it affects the built image, so all users of the image has this setting although it wouldn't make sense for them. The preferred approach is to use `ARG DEBIAN_FRONTEND=noninteractive` but this doesn't seem to work on Ubuntu (attempted in `docker-debconf-dialog`). Will revisit in `docker-multiarch`.
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Fixes two warnings in the Docker builds:
apt-utilsresolves it. Did it in a separate cache layer for transparency, so the firstapt-get installabove it and it's own install still outputs the warning.ENVbut it would be persisted for the users of the image and thus not recommended. The proposed solution in that link usesARGbut did not work.docker-multiarchis based on Debian:stretch and it seems to work there. (At the moment of writing I'm waiting for final build)