Organize GitHub summary by image and version

[jnewton03]

Problem

Matrix jobs in the published images vulnerability scanning workflow append to $GITHUB_STEP_SUMMARY in completion order (non-deterministic), resulting in randomly ordered scan results.

Desired Behavior

Organize results:

1. By image (liquibase/liquibase first, then liquibase/liquibase-secure)
2. Within each image, by version (newest at top)

Proposed Solution: Artifact-Based Aggregation

Each matrix job writes its summary to a file and uploads as an artifact. A final job downloads all artifacts, sorts them, and writes one organized summary.

Changes Required

File	Changes
scripts/generate-dockerhub-matrix.sh	Add sort_key field (e.g., "0-000" for ordering)
scripts/append-github-summary.sh	Write to file instead of $GITHUB_STEP_SUMMARY
.github/workflows/trivy-scan-published-images.yml	Upload summary artifacts, aggregate in notify-results

Implementation Details

1. Add sort_key to matrix: First digit = image index (0=community, 1=secure), remaining = version index (000=newest)
2. Summary script: Write to local file summary-content.md instead of appending to summary
3. Workflow: Upload summary artifacts per job, download and aggregate in notify-results job

Expected Result

Before: Random order

5.0.1 (secure)
5.0.3 (community)
5.0.2 (secure)

After: Organized

# liquibase/liquibase
5.0.3
5.0.2
5.0.1

# liquibase/liquibase-secure
5.0.3
5.0.2
5.0.1

---

🤖 Generated with Claude Code