fix: make Trivy SARIF upload non-blocking

Add continue-on-error to upload-sarif step to prevent build failures
due to GitHub Security permissions issues in called workflows.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: samuelho-dev

.github/workflows/docker-build-push.yml

@@ -172,6 +172,7 @@ jobs:
 
       - name: Upload Trivy scan results to GitHub Security
         if: inputs.scan
+        continue-on-error: true # Don't fail build if upload fails (permissions issue)
         uses: github/codeql-action/upload-sarif@48ab28a6f5dbc2a99bf1e0131198dd8f1df78169 # v3.28.0
         with:
           sarif_file: 'trivy-results.sarif'