Adding site build script build_site.sh
diff --git a/build_site.sh b/build_site.sh
new file mode 100755
index 0000000..70f2e86
--- /dev/null
+++ b/build_site.sh
@@ -0,0 +1,14 @@
+#!/bin/bash
+
+WORKDIR=/tmp/incubator-ariatosca-site
+rm -rf $WORKDIR
+mkdir -p $WORKDIR
+bundle exec jekyll build --destination $WORKDIR $WORKDIR
+git checkout asf-site
+git clean -f -d
+git pull origin asf-site
+rm -rf *
+cp -a $WORKDIR/* .
+git add .
+git commit -m "Automatic Site Publish by Buildbot"
+git push origin asf-site
