index.ts (stateful app: create volume)

        volumeClaimTemplates: [
            {
                metadata: {
                    name: "data",
                    labels: {
                        app: "mariadb",
                        component: "master",
                        release: "example",
                    }
                },
                spec: {
                    accessModes: [
                        "ReadWriteOnce"
                    ],
                    resources: {
                        requests: {
                            storage: "8Gi"
                        }
                    }
                }
            }
        ]
    }