Added Build skeleton

Dockerfile

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+FROM docker:8
+LABEL maintainer="Torben Nehmer <torben@nehmer.net>"
+
+RUN set -ex; \
+	apt-get update; \
+	\
+	apt-get install -y --no-install-recommends \
+		ssmtp \
+	; \
+	\
+	rm -rf /var/lib/apt/lists/* ;\
+	apt-get clean ;\
+
+# Finally, publish the rootfs file into the container
+# This is done as last step to make docker build caching more efficient.
+ADD rootfs.tar.gz /

build-container.sh

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+#!/bin/bash
+
+set -ex
+
+docker build --force-rm -t nathan/docker8 -f Dockerfile build

build-rootfs.sh

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+#!/bin/bash
+
+set -ex
+
+# Configuration options you usually edit go here
+# CONTAINER_WEBROOT=/var/www/html
+
+# This is internal stuff used to build everything
+# Be aware, that several of these paths are used with rm -rf!
+SRCDIR=$(pwd)/src
+TMPDIR=$(pwd)/tmp
+BUILDDIR=$(pwd)/build
+SCRIPTS_SRC=${SRCDIR}/scripts
+ROOTFSTREE=${TMPDIR}/tree
+ROOTFSFILE=${BUILDDIR}/rootfs.tar.gz
+# WEBROOT_DST=${ROOTFSTREE}${CONTAINER_WEBROOT}
+
+#### Sanitize Build Enviornment
+if [ -d ${TMPDIR} ]; then
+	rm -rf ${TMPDIR}
+fi
+mkdir ${TMPDIR}
+
+if [ -d ${BUILDDIR} ]; then
+	rm -rf ${BUILDDIR}
+fi
+mkdir ${BUILDDIR}
+
+#### Do the work.
+#
+# ...
+#
+# Clean up behind us
+# if [ "$CLEAN_INTERMEDIATES" = true ]; then
+# 	rm -rf ${ROUNDCUBE_SRC}
+# 	rm -rf ${ISPCONFIG_SRC}
+# fi
+
+#### Now we tar everything together, so that the Dockerfile can put everything in place in one run
+tar -czf ${ROOTFSFILE} -C ${ROOTFSTREE} .
+
+# Clean up behind us
+if [ "$CLEAN_INTERMEDIATES" = true ]; then
+	rm -rf ${ROOTFSTREE}
+fi