chore(add sec scan): add sec scan

[pkanoongo]

Security Workflow Addition

This PR adds a standardized security scanning workflow to the repository.

Changes

• Added .github/workflows/security-scan.yaml workflow file
• Configured to run on pull requests, pushes to main, and manual dispatch
• Includes static analysis using Semgrep via open-turo/actions-security

Workflow Features

• Triggers: Pull requests, pushes to main branch, manual dispatch
• Permissions: Read contents, write PRs, write security events
• Static Analysis: Uses Semgrep for code security scanning
• Base Branch Checkout: Safely checks out the base branch for PR analysis

Security Benefits

• Automated security scanning on all code changes
• Integration with existing security tooling
• Standardized security practices across the organization
• Early detection of security issues before they reach production

What Gets Scanned

• Code Security: SQL injection, XSS, authentication bypass, etc.
• Secrets Detection: API keys, passwords, certificates
• Vulnerability Detection: Known security issues in dependencies