Create a auto build docker image

Version of application is calculated by the git tags

hook/version.sh

@@ -0,0 +1,12 @@
+#!/usr/bin/env bash
+set -e
+
+if [[ $(git describe --tags --dirty) =~ ^V?([0-9][0-9.]*(-dirty)?)$ ]]; then
+  VERSION="${BASH_REMATCH[1]}"
+elif [[ $(git describe --tags --dirty) =~ ^V?([0-9][0-9.]*)-([0-9]+)-g(.+(-dirty)?)$ ]]; then
+  VERSION="${BASH_REMATCH[1]}-${BASH_REMATCH[3]}"
+else
+  exit 1
+fi
+
+echo $VERSION