fix(helm): qualify default image references

[svvarom]

CRI‑O will reject short image names for K8s v1.34, so we need to use fully qualified image refs.

It’s better to embed the image source directly in the Helm chart templates instead of relying on implicit defaults.

Source: https://www.replicated.com/blog/breaking-change-kubernetes-1-34-tightens-image-name-resolution-rules----what-it-means-for-you

Summary by CodeRabbit

• Chores
  • Updated default container image references to use fully qualified Docker Hub paths.
  • Updated the Helm chart documentation to reflect the revised volume permissions image reference.

[github-actions]

Suite	Lines Covered	Line Rate	Branch Rate
Unit Tests	27157/34869	77.9%	62.1%
Integration Tests	15968/33581	47.5%	20.0%

[coderabbitai]

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ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between 97d5e6c and 0ed8f6f.

📒 Files selected for processing (2)

• k8s/helm/README.md
• k8s/helm/values.yaml

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📝 Walkthrough

Walkthrough

Helm defaults now use fully qualified Docker Hub image references for BusyBox and Envoy, and the README documents the updated BusyBox default.

Changes

Helm image references

Layer / File(s)	Summary
Update Helm image defaults and documentation k8s/helm/values.yaml, k8s/helm/README.md	volumePermissionsImage now uses docker.io/library/busybox; envoyProxy.image.repository now uses docker.io/envoyproxy/envoy; the README reflects the BusyBox update.

Suggested reviewers: ironcommit, crookedstorm

🚥 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 accurately summarizes the Helm change to fully qualify default image references.
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 qualify-helm-image-defaults/smuley

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