moved to multi multi stage build

docker ci executing hook with always pull before build. Therefore e.g. first image is created but right after overwritten by previous image.

hooks/pre_push

@@ -0,0 +1,13 @@
+#!/bin/sh
+
+set -o errexit
+set -o nounset 
+
+imageSuffix=""
+if [ "$SOURCE_BRANCH" != "master" ]; then
+	imageSuffix="-$(echo "$SOURCE_BRANCH" | sed 's/\//-/g')"
+fi
+
+cd ..
+
+bash test/testBuild.sh "$imageSuffix" --skip-ttt --push