Added a showcase of minimal Docker image

docker/bare/Dockerfile

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+FROM scratch
+ADD root /

docker/bare/README.md

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+## The bare minimum ClickHouse Docker image.
+
+It is intented as a showcase to check the amount of implicit dependencies of ClickHouse from the OS in addition to the OS kernel.
+
+Example usage:
+
+```
+./prepare
+docker build --tag clickhouse-bare .
+```
+
+Run clickhouse-local:
+```
+docker run -it --rm --network host clickhouse-bare /clickhouse local --query "SELECT 1"
+```
+
+Run clickhouse-client in interactive mode:
+```
+docker run -it --rm --network host clickhouse-bare /clickhouse client
+```
+
+Run clickhouse-server:
+```
+docker run -it --rm --network host clickhouse-bare /clickhouse server
+```
+
+It can be also run in chroot instead of Docker (first edit the `prepare` script to enable `proc`):
+
+```
+sudo chroot . /clickhouse server
+```
+
+## What does it miss?
+
+- creation of `clickhouse` user to run the server;

docker/bare/prepare

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+#!/bin/bash
+
+set -e
+
+SRC_DIR=../..
+BUILD_DIR=${SRC_DIR}/build
+
+mkdir root
+pushd root
+mkdir lib lib64 etc tmp root
+cp ${BUILD_DIR}/programs/clickhouse .
+cp ${SRC_DIR}/programs/server/{config,users}.xml .
+cp /lib/x86_64-linux-gnu/{libc.so.6,libdl.so.2,libm.so.6,libpthread.so.0,librt.so.1,libnss_dns.so.2,libresolv.so.2} lib
+cp /lib64/ld-linux-x86-64.so.2 lib64
+cp /etc/resolv.conf ./etc
+strip clickhouse
+
+# This is needed for chroot but not needed for Docker:
+
+# mkdir proc
+# sudo mount --bind /proc proc