plugin-barman-cloud fails with Istio sidecar injection enabled

Description

When using CloudNativePG with the plugin-barman-cloud.cloudnative-pg.io plugin in a namespace where Istio sidecar injection is enabled, the operator fails to create Pods.

Environment

CNPG version: 1.26.1
Kubernetes version: v1.29.14
Istio version: 1.18.2

Steps to reproduce

1. Create a namespace with Istio injection enabled
2. Deploy CNPG Cluster with plugin-barman-cloud enabled
3. Observe the operator logs and Pod creation

Actual result

Pods cannot be created. Operator logs show:

{"level":"info","ts":"2025-09-11T11:10:20.313679675Z","msg":"Creating new Pod to reattach a PVC","controller":"cluster","controllerGroup":"postgresql.cnpg.io","controllerKind":"Cluster","Cluster":{"name":"pg-cluster-test2","namespace":"test2"},"namespace":"test2","name":"pg-cluster-test2","reconcileID":"6bb22819-9916-4040-b8b6-e5e408e0db7a","pod":"pg-cluster-test2-1","pvc":"pg-cluster-test2-1"}                                                                                                                                                                                                                                                                           
{"level":"error","ts":"2025-09-11T11:10:20.381608713Z","msg":"Reconciler error","controller":"cluster","controllerGroup":"postgresql.cnpg.io","controllerKind":"Cluster","Cluster":{"name":"pg-cluster-test2","namespace":"test2"},"namespace":"test2","name":"pg-cluster-test2","reconcileID":"6bb22819-9916-4040-b8b6-e5e408e0db7a","error":"unable to create Pod: Pod \"pg-cluster-test2-1\" is invalid: spec.initContainers[2].startupProbe: Forbidden: may not be set for init containers without restartPolicy=Always","stacktrace":"sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller[...]).reconcileHandler\n\tpkg/mod/sigs.k8s.io/controller-runtime@v0.21.0/pkg/internal/controller/controller.go:353\nsigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller[...]).processNextWorkItem\n\tpkg/mod/sigs.k8s.io/controller-runtime@v0.21.0/pkg/internal/controller/controller.go:300\nsigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller[...]).Start.func2.1\n\tpkg/mod/sigs.k8s.io/controller-runtime@v0.21.0/pkg/internal/controller/controller.go:202"}

Expected result

Pods should be created successfully,
WAL archiver / backup plugin should work correctly,
Istio injection should either be compatible or possible to disable only for backup/archiver Pods.

Bắt đầu với các bước tái hiện được liệt kê bằng cách sử dụng CloudNativePG 1.26.1, Kubernetes 1.29.14, Istio 1.18.2 và plugin-barman-cloud plugin. Điều tra quy trình tạo Pod của operator và lỗi xác thực initContainer startupProbe được báo cáo khi khởi động. Được coi là hoàn tất khi Cluster tạo Pods thành công với Istio injection được bật và việc lưu trữ WAL hoặc backup hoạt động như mong đợi.