Add docker image (#375)

* Add Dockerfile

Add documentation

Ref #375

* Add PORT, VOLUME and reduce size of the docker image significantly

Fix doc and reduce image size

Fix #375

* Fix docker compose

substrate/docker/build.sh

@@ -0,0 +1,18 @@
+#!/usr/bin/env bash
+set -e
+
+# Find the current version from Cargo.toml
+VERSION=`grep "^version" ../Cargo.toml | egrep -o "([0-9\.]+)"`
+GITUSER=chevdor
+GITREPO=polkadot
+
+# Build the image
+echo "Building ${GITREPO}:$VERSION docker image, hang on!"
+time docker build --build-arg PROFILE=release -t ${GITUSER}/${GITREPO}:$VERSION .
+
+# Show the list of available images for this repo
+echo "Image is ready"
+docker images | grep ${GITREPO}
+
+echo -e "\nIf you just built the latest, you may want to update your tag:"
+echo " $ docker tag ${GITUSER}/${GITREPO}:$VERSION ${GITUSER}/${GITREPO}:latest"