Add garage helm chart wrapper

S3-compatible object store (dxflrs/garage), single-node by default with
hostPath/PVC persistence, existingSecret for rpc/admin/metrics tokens, and
a postStart hook that bootstraps the single-node layout automatically.
Tracks upstream via dockerhub-tags-pattern for scripts/update-charts.sh.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014ZA4cJygj4VPCYVms4TDrH

garage/templates/pvc.yaml

@@ -0,0 +1,47 @@
+{{- if .Values.persistence.data.enabled }}
+{{- if eq .Values.persistence.data.type "pvc" }}
+{{- if not .Values.persistence.data.existingClaim }}
+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: {{ include "garage.fullname" . }}-data
+  labels:
+    {{- include "garage.labels" . | nindent 4 }}
+  annotations:
+    kustomize.toolkit.fluxcd.io/prune: disabled
+spec:
+  accessModes:
+    {{- toYaml .Values.persistence.data.accessModes | nindent 4 }}
+  resources:
+    requests:
+      storage: {{ .Values.persistence.data.size | quote }}
+  {{- if .Values.persistence.data.storageClass }}
+  storageClassName: {{ .Values.persistence.data.storageClass | quote }}
+  {{- end }}
+{{- end }}
+{{- end }}
+{{- end }}
+---
+{{- if .Values.persistence.meta.enabled }}
+{{- if eq .Values.persistence.meta.type "pvc" }}
+{{- if not .Values.persistence.meta.existingClaim }}
+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: {{ include "garage.fullname" . }}-meta
+  labels:
+    {{- include "garage.labels" . | nindent 4 }}
+  annotations:
+    kustomize.toolkit.fluxcd.io/prune: disabled
+spec:
+  accessModes:
+    {{- toYaml .Values.persistence.meta.accessModes | nindent 4 }}
+  resources:
+    requests:
+      storage: {{ .Values.persistence.meta.size | quote }}
+  {{- if .Values.persistence.meta.storageClass }}
+  storageClassName: {{ .Values.persistence.meta.storageClass | quote }}
+  {{- end }}
+{{- end }}
+{{- end }}
+{{- end }}