Use kustomize images for Alpine tag

Keep all container tags in kustomization.yaml for easy version management.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

argocd/manifests/grafana/deployment.yaml

@@ -48,7 +48,7 @@ spec:
         # Fetch TeslaMate dashboards from forge mirror at a pinned tag.
         # To upgrade: update TESLAMATE_VERSION below.
         - name: init-teslamate-dashboards
-          image: docker.io/library/alpine:3.21
+          image: docker.io/library/alpine:kustomized
           imagePullPolicy: IfNotPresent
           command: ["sh", "-c"]
           args:

argocd/manifests/grafana/kustomization.yaml

@@ -11,6 +11,8 @@ resources:
   - rbac.yaml
 
 images:
+  - name: docker.io/library/alpine
+    newTag: "3.21"
   - name: docker.io/library/busybox
     newTag: 1.31.1
   - name: registry.ops.eblu.me/blumeops/grafana-sidecar