- ImageUpdateCheck model + ImageUpdateService: compare an app's local
RepoDigest against the registry's current index digest (via
`docker buildx imagetools inspect`) for the same tag, and flag
update_available when they differ. Shells out to docker like the rest of
the Docker layer; degrades gracefully when the image is local-only or the
registry is unreachable.
- API: admin POST /api/v1/image-updates/applications/<id>/check and
GET /api/v1/image-updates/applications/<id> for the latest result.
- Application.to_dict gains a lightweight image_update badge (mirrors the
existing image_scan badge).
- 7 tests: digest diff/match/unknown, no-image, badge, endpoint, auth gate.
One-click apply (pull + recreate) to follow.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Juan Denis