🛡️ Sentinel: Add Secret Detection to CI Pipeline

[google-labs-jules]

🚨 Severity: MEDIUM
💡 Vulnerability: The CI/CD pipeline was missing an automated scan for hardcoded secrets. This created a risk that credentials like API keys or passwords could be accidentally committed and exposed.
🎯 Impact: If a developer were to accidentally commit a secret, an attacker could discover it, leading to unauthorized access to sensitive systems and a critical security breach.
🔧 Fix: I have enhanced the security of the CI/CD pipeline by including the official GitLab Security/Secret-Detection.gitlab-ci.yml template in the .gitlab-ci.yml file. This adds a dedicated secret_detection job that runs automatically on every commit to find exposed secrets.
✅ Verification: The .gitlab-ci.yml file has been updated and its syntax has been validated with yamllint. The new secret_detection job will now execute as a standard part of the GitLab CI pipeline, providing continuous protection against secret leakage.

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PR created automatically by Jules for task 14988204987631843343 started by @sbusanelli

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