chore: Add Trivy filesystem scan

[AmberJBlue]

Summary by Sourcery

Add a GitHub Actions workflow to perform file system vulnerability scans using Trivy and surface results in the Security tab

CI:

• Introduce a security-scan workflow triggered on main branch events and manual dispatch
• Run Trivy FS scans with SARIF output and enforce failure on critical/high vulnerabilities
• Upload Trivy SARIF report to GitHub Security tab under a dedicated category

[sourcery-ai]

Reviewer's Guide

Introduce a new GitHub Actions workflow that runs a Trivy filesystem scan on commits and pull requests to main, captures all vulnerabilities in SARIF format, enforces a fail-on-high-severity check, and uploads results to the Security tab.

Sequence diagram for Trivy scan and SARIF upload in CI

sequenceDiagram
    participant Developer
    participant GitHubActions
    participant Trivy
    participant SecurityTab
    Developer->>GitHubActions: Push/PR to main
    GitHubActions->>GitHubActions: Checkout code
    GitHubActions->>Trivy: Run FS scan (SARIF output)
    Trivy-->>GitHubActions: trivy-results.sarif
    GitHubActions->>Trivy: Run FS scan (Table output, fail on CRITICAL/HIGH)
    Trivy-->>GitHubActions: Vulnerability report
    GitHubActions->>SecurityTab: Upload SARIF results
    SecurityTab-->>GitHubActions: Results available

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File-Level Changes

Change	Details	Files
Add Trivy filesystem scan workflow	Define workflow triggers for push, pull_request, and manual dispatch Configure trivy-fs job with checkout and required permissions Add initial Trivy scan step producing SARIF output for all severities Add secondary Trivy scan step failing on CRITICAL/HIGH vulnerabilities Upload SARIF report to GitHub Security tab unconditionally	.github/workflows/security-scan.yaml

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[sourcery-ai]

Hey there - I've reviewed your changes and they look great!

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[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.