Added a variant of Docker-in-Docker with docker compose

1.11/dind-compose/Dockerfile

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+FROM docker:1.11-dind
+
+RUN apk add --no-cache \
+		'py-pip==8.1.2-r0'
+
+RUN set -x \
+	&& pip install 'docker-compose'
+
+COPY dockerd-entrypoint.sh /usr/local/bin/
+
+VOLUME /var/lib/docker
+EXPOSE 2375
+
+ENTRYPOINT ["dockerd-entrypoint.sh"]
+CMD []

1.11/dind-compose/dockerd-entrypoint.sh

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+#!/bin/sh
+set -e
+
+# no arguments passed
+# or first arg is `-f` or `--some-option`
+if [ "$#" -eq 0 -o "${1#-}" != "$1" ]; then
+	# add our default arguments
+	set -- docker daemon \
+		--host=unix:///var/run/docker.sock \
+		--host=tcp://0.0.0.0:2375 \
+		--storage-driver=vfs \
+		"$@"
+fi
+
+if [ "$1" = 'docker' -a "$2" = 'daemon' ]; then
+	# if we're running Docker, let's pipe through dind
+	# (and we'll run dind explicitly with "sh" since its shebang is /bin/bash)
+	set -- sh "$(which dind)" "$@"
+fi
+
+exec "$@"

1.12/dind-compose/Dockerfile

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+FROM docker:1.12-dind
+
+RUN apk add --no-cache \
+		'py-pip==8.1.2-r0'
+
+RUN set -x \
+	&& pip install 'docker-compose'
+
+COPY dockerd-entrypoint.sh /usr/local/bin/
+
+VOLUME /var/lib/docker
+EXPOSE 2375
+
+ENTRYPOINT ["dockerd-entrypoint.sh"]
+CMD []

1.12/dind-compose/dockerd-entrypoint.sh

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+#!/bin/sh
+set -e
+
+# no arguments passed
+# or first arg is `-f` or `--some-option`
+if [ "$#" -eq 0 -o "${1#-}" != "$1" ]; then
+	# add our default arguments
+	set -- docker daemon \
+		--host=unix:///var/run/docker.sock \
+		--host=tcp://0.0.0.0:2375 \
+		--storage-driver=vfs \
+		"$@"
+fi
+
+if [ "$1" = 'docker' -a "$2" = 'daemon' ]; then
+	# if we're running Docker, let's pipe through dind
+	# (and we'll run dind explicitly with "sh" since its shebang is /bin/bash)
+	set -- sh "$(which dind)" "$@"
+fi
+
+exec "$@"