initial commit with custom qemu

Signed-off-by: Petros Angelatos <petrosagg@gmail.com>

.dockerignore

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+Dockerfile

Dockerfile

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+FROM resin/armv7hf-debian:jessie
+
+ENV QEMU_EXECVE 1
+COPY . /usr/bin

cross-build-end

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+#!/usr/bin/qemu-arm-static /bin/sh.real
+
+mv /bin/sh.real /bin/sh

cross-build-start

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+#!/usr/bin/qemu-arm-static /bin/sh
+
+mv /bin/sh /bin/sh.real
+cp /usr/bin/sh-shim /bin/sh

sh-shim

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+#!/usr/bin/qemu-arm-static /bin/sh.real
+
+set -o errexit
+
+cp /bin/sh.real /bin/sh
+
+/bin/sh "$@"
+
+cp /usr/bin/sh-shim /bin/sh