Adds Shell Script Security Checks via Shellcheck tool
This merge request introduces enhancements to our Gitlab CI Security Templates to improve the security of shell scripts.
I am pushing the following changes:
- Utilized the ShellCheck tool to scan shell scripts for potential vulnerabilities and coding issues.
- Combined git grep and git ls-files commands to gather shell script files efficiently, minimizing duplicate scans.
Please review and provide your feedback. Thanks.
Bug: T346163