OPSEXP-3343: Allow overridding KinD configuration & skip nginx ingress installation

[alxgomz]

Checklist

• Jira Reference (also in PR title):
• README updated after adding/changing behaviour of an action
• Proposed version increment for release:
  • Patch (bugfix)
  • Minor (new feature)
  • Major (breaking changes)
• External PR link where changes has been tested:

Description

Ref: OPSEXP-3343

• Allow overridding KinD configuration
• Skip nginx ingress installation

[Copilot]

Pull Request Overview

This PR enhances the KinD (Kubernetes in Docker) setup action to provide more flexibility during cluster creation by allowing custom configuration overrides and optional nginx ingress installation.

• Add support for custom KinD configuration via YAML string override
• Allow skipping nginx ingress installation by setting the reference to "skip" or "none"
• Update documentation to reflect new configuration options

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
docs/README.md	Documents new kind-config-override parameter and skip option for nginx ingress
.github/actions/setup-kind/action.yml	Implements configuration override functionality and conditional nginx ingress installation

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