chore: add KIND_CONFIG variable to override kind configuration

[trevex]

What

Allows overriding kind cluster, required for OIDC setup for kind cluster used by UI E2E test, see opendefensecloud/solution-arsenal#397

Why

See above.

Testing

See above.

Checklist

• Tests added/updated
• No breaking changes (or upgrade path documented above)
• Readable commit history (squashed and cleaned up as desired)
• AI code review considered and comments resolved

Summary by CodeRabbit

Release Notes

• Chores
  • Enhanced local cluster setup to support custom Kind cluster configuration when specified.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: dbce7596-a23f-4695-a98e-12c27d5b17e0

📥 Commits

Reviewing files that changed from the base of the PR and between 5107b50 and ee759b0.

📒 Files selected for processing (1)

• common.mk

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📝 Walkthrough

Walkthrough

In common.mk, the setup-local-cluster target's kind create cluster command is updated to conditionally append --config $(KIND_CONFIG) when the KIND_CONFIG variable is non-empty. No other targets or declarations are modified.

Changes

Conditional KIND_CONFIG Support

Layer / File(s)	Summary
Conditional --config flag for Kind cluster creation common.mk	The kind create cluster command now conditionally appends --config $(KIND_CONFIG) when KIND_CONFIG is set, replacing the previous unconditional invocation without a config flag.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

A bunny hops in, config in paw,
"Kind cluster, here's your missing claw!"
One line changed, a flag now flows,
--config blooms where nothing grows.
🐇 Small fix, but gardens grow!

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title directly addresses the main change: introducing a KIND_CONFIG variable to override kind cluster configuration, which matches the changeset.
Description check	✅ Passed	The description covers most required sections with clear explanations, though the 'Why' and 'Testing' sections lack detail beyond referring to an external issue.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/allow-overriding-kind-config

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