Add error handling to script with set -e flag

Ensure script exits immediately on any command failure by adding
the -e flag to the set command.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: haya14busa

script.sh

@@ -1,5 +1,5 @@
 #!/bin/sh
-set -x
+set -ex
 
 cd "${GITHUB_WORKSPACE}" || exit