fix: persist DEFAULT_CHANNEL in prepare-release

[thomasmaas]

Summary

• Add DEFAULT_CHANNEL and BUNDLE_DEFAULT_CHANNEL to the values written to make/release.mk by the prepare-release target

Why

prepare-release already persisted CHANNELS/BUNDLE_CHANNELS into make/release.mk, but never did the same for DEFAULT_CHANNEL/BUNDLE_DEFAULT_CHANNEL. This meant any subsequent make bundle invocation on a release branch silently fell back to the Makefile default (unset), producing bundles without an explicit channel.default.v1 annotation.

Same class of bug fixed for limitador-operator in Kuadrant/limitador-operator#268 / Kuadrant/limitador-operator#269.

Test plan

• make prepare-release VERSION=0.0.0-test CHANNELS=stable DEFAULT_CHANNEL=stable writes both channel values to make/release.mk
• Generated bundle.Dockerfile and bundle/metadata/annotations.yaml contain channel.default.v1=stable

🤖 Generated with Claude Code

Summary by CodeRabbit

• Bug Fixes
  • Release preparation now preserves the configured default update channel in generated release settings.
  • Bundled releases are configured to use the selected default channel automatically.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 6eff6bb0-533f-4e83-a3a1-054ac142a029

📥 Commits

Reviewing files that changed from the base of the PR and between 94781f9 and fb40391.

📒 Files selected for processing (1)

• Makefile

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📝 Walkthrough

Walkthrough

The prepare-release target now includes default-channel configuration when generating make/release.mk, alongside the existing bundle channels and version overrides.

Changes

Release channel configuration

Layer / File(s)	Summary
Write release channel overrides Makefile	prepare-release now writes DEFAULT_CHANNEL and the derived BUNDLE_DEFAULT_CHANNEL flag to the generated release makefile.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Suggested reviewers: mikenairn

Poem

A rabbit hops through release night,
Adding channels neat and bright.
Defaults join the bundle’s trail,
While version notes remain in place.
Hop, hop—prepare the release!

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly matches the main change: persisting DEFAULT_CHANNEL in prepare-release.
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.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/default-channel-stable

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