0.3.0: Longhorn CSI skeleton (#347 phase 1) — additive, default-off

templates/longhorn.yaml

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+{{- if .Values.longhorn.enabled }}
+# Tenant data StorageClass. Tower's instance overlays don't pin a
+# storageClassName today (they let the cluster default decide). Phase
+# 1 of ADR 0003 just defines this class so Phase 2/3 can flip new
+# instances to bind here without further chart changes.
+#
+# `replicaCount` comes from values; Standalone tier ships replicas=1
+# (durability is hourly S3, not local mirrors).
+apiVersion: storage.k8s.io/v1
+kind: StorageClass
+metadata:
+  name: longhorn-tenants
+  annotations:
+    # Not the cluster default in Phase 1 — explicit opt-in only.
+    storageclass.kubernetes.io/is-default-class: "false"
+provisioner: driver.longhorn.io
+allowVolumeExpansion: true
+reclaimPolicy: Delete
+volumeBindingMode: Immediate
+parameters:
+  numberOfReplicas: "{{ .Values.longhorn.replicas }}"
+  staleReplicaTimeout: "30"
+  fromBackup: ""
+  # fsType: ext4 is the default; explicit so the contract is in Git.
+  fsType: "ext4"
+---
+# VolumeSnapshotClass — the API surface the Tower backend will
+# consume in Phase 3 to take snapshots of source PVCs before
+# spawn-env / Refresh ↓.
+#
+# `type: snap` (Longhorn's in-place snapshot) is what we want for
+# the fast Clone path: the snapshot is a CoW reference, not an S3
+# upload. `type: bak` is the slower S3-bound block backup, used
+# only by the daily DR layer.
+apiVersion: snapshot.storage.k8s.io/v1
+kind: VolumeSnapshotClass
+metadata:
+  name: longhorn-snapshot-class
+driver: driver.longhorn.io
+deletionPolicy: Delete
+parameters:
+  type: snap
+{{- end }}