Sidecar image with private registry & authentication in air-gapped environment

Follow-up on https://github.com/cloudnative-pg/plugin-barman-cloud/issues/391

Hello,

I understand I can modify the location of the sidecar image with an env variable in the operator deployment and it works fine with our lab environment, where we use the harbor registry and no auth.
That said, we are required to use other registries from dev to prod environments and I don't understand how I can define imagePullSecrets for the sidecar container since it's not a regular PodSpec resource.

Any advice or suggestion ?

For the record, we transitioned all other images ( controllers + PG) to our internal registry with authentication, no issue.

Thanks

首先跟进 issue #391，检查如何通过 operator deployment 配置 sidecar image。确定如何在 air-gapped 环境中为 sidecar 提供经过身份验证的 registry 凭据；当受支持的配置明确并且能在所描述的环境中运行时，即可完成。

由索引模型根据 Issue 内容生成。