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/Chart.yaml

@@ -0,0 +1,8 @@
+apiVersion: v2
+name: garage
+description: A Helm chart for Garage, a lightweight S3-compatible object store
+type: application
+annotations:
+  version-source: dockerhub-tags-pattern:dxflrs/garage:^v[0-9]+\.[0-9]+\.[0-9]+$
+version: 0.1.0
+appVersion: "v2.4.1"