Add error handling to build script

Author: adler3d

stable/build.sh

@@ -1,7 +1,8 @@
+set -e
 set -o errexit
 set -o pipefail
 g++ -O2 -std=c++17 QapGen/QapGen.cpp -o QapGen.elf
 mv QapGen.elf Release
 cd Release
 ./QapGen.elf input.qapdsl.hpp|head
-cd ..
+cd ..