Try to do multi-arch on docker hub

Dockerfile.armhf

@@ -1,8 +1,6 @@
-FROM resin/rpi-raspbian:jessie
+FROM raspbian/jessie
 MAINTAINER ViViDboarder <vividboarder@gmail.com>
 
-RUN [ "cross-build-start" ]
-
 RUN apt-get update \
         && apt-get install -y --no-install-recommends \
             cron \
@@ -26,8 +24,6 @@ RUN apt-get update \
             python-swiftclient \
         && rm -rf /var/apt/lists/*
 
-RUN [ "cross-build-end" ]
-
 VOLUME /root/.cache/duplicity
 VOLUME /backups
 VOLUME /var/lock/duplicity

hooks/pre_build

@@ -0,0 +1,8 @@
+#!/bin/bash
+
+BUILD_ARCH=$(echo "${DOCKERFILE_PATH}" | cut -d '.' -f 2)
+
+[ "${BUILD_ARCH}" == "Dockerfile" ] && \
+    { echo 'qemu-user-static: Registration not required for current arch'; exit 0; }
+
+docker run --rm --privileged multiarch/qemu-user-static:register --reset