Trigger operator certification PR on release

[pdabelf5]

Proposed changes

Trigger operator certification PR on release

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING doc
• I have added tests that prove my fix is effective or that my feature works
• I have checked that all unit tests pass after adding my changes
• I have updated necessary documentation
• I have rebased my branch onto main
• I will ensure my PR is targeting the main branch and pulling from my branch from my own fork

[Copilot]

Pull Request Overview

Adds automation to create a certification PR for Red Hat OpenShift when the nginx-ingress-operator is released. This workflow will automatically update the certified-operators repository and create a pull request for operator certification.

• Adds a new job "create-pr" to the release workflow
• Automates the process of copying bundle files to the certified-operators repository
• Creates a pull request in the Red Hat OpenShift ecosystem for operator certification

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}