Add/Update Nautilus SecureSDLC workflow

[rkgh4096]

This PR adds or updates the Nautilus SecureSDLC workflow to enable automated security scanning.

Changes

• Adds/updates .github/workflows/securesdlc.yml
• Enables security scanning on push events
• Supports workflow dispatch for manual runs

Requirements

This workflow requires the following secrets to be configured in the repository:

• SEMGREP_APP_URL: The URL of your Semgrep App instance
• SEMGREP_APP_TOKEN: The API token for Semgrep App

Testing

The workflow will run automatically on:

• Push events to the default branch
• Manual workflow dispatch
• When called by other workflows

[github-advanced-security]

This pull request sets up GitHub code scanning for this repository. Once the scans have completed and the checks have passed, the analysis results for this pull request branch will appear on this overview. Once you merge this pull request, the 'Security' tab will show more code scanning analysis results (for example, for the default branch). Depending on your configuration and choice of analysis tool, future pull requests will be annotated with code scanning analysis results. For more information about GitHub code scanning, check out the documentation.