scheduling: keep longhorn vault sync off storage nodes

infrastructure/longhorn/core/vault-sync-deployment.yaml

@@ -26,6 +26,16 @@ spec:
                   - key: hardware
                     operator: In
                     values: ["rpi5", "rpi4"]
+            - weight: 90
+              preference:
+                matchExpressions:
+                  - key: kubernetes.io/hostname
+                    operator: NotIn
+                    values:
+                      - titan-13
+                      - titan-15
+                      - titan-17
+                      - titan-19
       containers:
         - name: sync
           image: alpine:3.20