add build script for testing

build.sh

+#!/bin/bash
+
+HUGO=$(pwd)/../hugo
+
+$HUGO version
+$HUGO -D
+
+cd external
+rm -rf all_build all_install
+mkdir all_build
+cmake -S all -B all_build -DCM_ALL_AUTO_DOC=ON -DCMAKE_INSTALL_PREFIX=$(pwd)/all_install
+cmake --build all_build
+cmake --install all_build