Not possible to set imagePullSecrets for sidecars

[gtirloni]

Report

While using a private container registry with authentication, I noticed that it's not possible to specify imagePullSecrets in the pxc CRD for sidecars (e.g. mysqld-exporter).

More about the problem

Sidecars fail to pull image from private repository.

Steps to reproduce

pxc:
  sidecars:
    - name: mysqld-exporter
      image: some.private.registry/mysqld-exporter
      imagePullSecrets:
        - name: secret_name

Versions

1. Kubernetes: 1.28
2. Operator: 1.14
3. Database: MySQL 8.0.32-24.2

Anything else?

No response