fix(longhorn): use jq instead of jsonpath for node/volume queries

bitnami/kubectl:latest includes jq, simpler than complex jsonpath filters.
Tested: successfully expanded all 1-replica volumes to 3 replicas.

k8s/infrastructure/longhorn/expand-replicas-job.yaml

@@ -1,6 +1,4 @@
 # PostSync hook Job that expands all Longhorn volumes to 3 replicas.
-# Runs after the longhorn-config Application syncs (which adds cp-2/cp-3 nodes
-# + taint toleration), ensuring there are 3 nodes available before expanding.
 apiVersion: batch/v1
 kind: Job
 metadata:
@@ -28,9 +26,8 @@ spec:
           
           echo "Waiting for all 3 Longhorn nodes to be Ready..."
           for i in {1..30}; do
-            READY_COUNT=$(kubectl -n longhorn-system get nodes.longhorn.io \
-              -o jsonpath='{range .items[?(@.status.conditions[?(@.type=="Ready")].status=="True")]}{.metadata.name}{"\n"}{end}' \
-              | wc -l | tr -d ' ')
+            READY_COUNT=$(kubectl -n longhorn-system get nodes.longhorn.io -o json | \
+              jq -r '[.items[] | select(.status.conditions[] | select(.type=="Ready" and .status=="True"))] | length')
             
             if [ "$READY_COUNT" -ge 3 ]; then
               echo "✓ All 3 nodes Ready"
@@ -49,16 +46,19 @@ spec:
           echo
           echo "Expanding volumes with < 3 replicas..."
           
-          kubectl -n longhorn-system get volumes.longhorn.io \
-            -o jsonpath='{range .items[?(@.spec.numberOfReplicas<3)]}{.metadata.name}{"\n"}{end}' | \
-          while read -r vol; do
-            if [ -n "$vol" ]; then
+          VOLUMES=$(kubectl -n longhorn-system get volumes.longhorn.io -o json | \
+            jq -r '.items[] | select(.spec.numberOfReplicas < 3) | .metadata.name')
+          
+          if [ -z "$VOLUMES" ]; then
+            echo "  No volumes need expansion"
+          else
+            echo "$VOLUMES" | while read -r vol; do
               CURRENT=$(kubectl -n longhorn-system get volume "$vol" -o jsonpath='{.spec.numberOfReplicas}')
               echo "  $vol: $CURRENT → 3 replicas"
               kubectl -n longhorn-system patch volume "$vol" --type merge \
                 -p '{"spec":{"numberOfReplicas":3}}'
-            fi
-          done
+            done
+          fi
           
           echo
           echo "Done. Final replica counts:"