use statefulSets and readinessProbes instead of initContainers

clusters/default/tools/nextcloud/nextcloud-db.yml

@@ -1,6 +1,6 @@
 ---
 apiVersion: apps/v1
-kind: Deployment
+kind: StatefulSet
 metadata:
   name: nextcloud-db
   namespace: tools
@@ -8,6 +8,8 @@ spec:
   selector:
     matchLabels:
       app: nextcloud-db
+  serviceName: nextcloud-db
+  replicas: 1
   template:
     metadata:
       labels:
@@ -36,9 +38,14 @@ spec:
         - name: MARIADB_AUTO_UPGRADE
           value: "1"
         volumeMounts:
-        - name: nextcloud-db-storage
+        - name: nextcloud-db
           mountPath: /var/lib/mysql
-      volumes:
-      - name: nextcloud-db-storage
-        persistentVolumeClaim:
-          claimName: nextcloud-db-longhorn
+  volumeClaimTemplates:
+  - metadata:
+      name: nextcloud-db
+    spec:
+      accessModes: ["ReadWriteOnce"]
+      resources:
+        requests:
+          storage: 2Gi
+      storageClassName: longhorn