feat(k8s/immich): add persistent NFS cache for library backup

kubernetes/app/immich/cronjob-backup.yaml

@@ -1,3 +1,15 @@
+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: immich-backup-cache
+  namespace: immich
+spec:
+  accessModes: ["ReadWriteOnce"]
+  storageClassName: nfs-synology-ssd
+  resources:
+    requests:
+      storage: 1Gi
+---
 apiVersion: batch/v1
 kind: CronJob
 metadata:
@@ -119,6 +131,8 @@ spec:
                     secretKeyRef:
                       name: immich-backup-config
                       key: B2_ACCOUNT_KEY
+                - name: RESTIC_CACHE_DIR
+                  value: /cache
               volumeMounts:
                 - name: secrets
                   mountPath: /secrets
@@ -126,6 +140,8 @@ spec:
                 - name: library
                   mountPath: /data
                   readOnly: true
+                - name: cache
+                  mountPath: /cache
               resources:
                 requests:
                   cpu: 100m
@@ -139,3 +155,6 @@ spec:
             - name: library
               persistentVolumeClaim:
                 claimName: immich-library
+            - name: cache
+              persistentVolumeClaim:
+                claimName: immich-backup-cache