[Bug]: Fix shellcheck errors

[sxd]

Is there an existing issue already for this bug?

• I have searched for an existing issue, and could not find anything. I believe this is a new bug.

I have read the troubleshooting guide

• I have read the troubleshooting guide and I think this is a new bug.

I am running a supported version of CloudNativePG

• I have read the troubleshooting guide and I think this is a new bug.

Contact Details

No response

Version

1.27 (latest patch)

What version of Kubernetes are you using?

1.33

What is your Kubernetes environment?

Self-managed: kind (evaluation)

How did you install the operator?

YAML manifest

What happened?

With the latest version of shellcheck released on August 3th, a few new checks where added, one of those is SC2329 about functions never used, we're falling with this error.

Cluster resource

Relevant log output

Code of Conduct

• I agree to follow this project's Code of Conduct