feat: enable ArgoCD Image Updater for portfolio deployment

- Add argocd-image-updater annotations to auto-detect :latest image changes
- Updater will poll registry and trigger ArgoCD sync when new build pushed
- Deployment pulls latest image on pod restart

Enables automatic updates without manual ArgoCD sync

infra/portfolio/base/deployment.yaml

@@ -6,6 +6,9 @@ metadata:
   labels:
     app.kubernetes.io/name: portfolio
     app.kubernetes.io/component: web
+  annotations:
+    argocd-image-updater.argoproj.io/image-list: portfolio=forgejo.riotpiao.com/rock/portfolio
+    argocd-image-updater.argoproj.io/portfolio.update-strategy: latest
 spec:
   replicas: 2
   selector: