feat: Add support for global env registry in kvisor

[oanatmaria]

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Kimchi Summary

What changed

Adds support for a global container registry override via global.registry value. All image references across the chart now use a new helper template that prepends the global registry when set, enabling centralized registry configuration.

Why

Enables deployment in air-gapped environments or with private registry mirrors without manually overriding each individual image repository.

Key changes

• Added kvisor.imageRepository helper in _helpers.tpl to resolve image repositories with optional global.registry prefix
• Updated charts/kvisor/templates/agent.yaml to use helper for gpu-feature-discovery, kvisor, obi, otel-collector, and dcgm-exporter containers
• Updated charts/kvisor/templates/cast-mock-server.yaml to use helper for the generator container
• Updated charts/kvisor/templates/clickhouse.yaml to use helper for schema and storage containers
• Updated charts/kvisor/templates/controller.yaml to use helper for controller and otel-collector containers
• Updated charts/kvisor/templates/event-generator.yaml to use helper for the generator container

Impact

Backward compatible: if global.registry is unset, images resolve to their original repositories. Set global.registry (e.g., my-registry.io/castai) to prefix all images automatically.

[kimchi-review]

Kimchi Code Review

Property	Value
Commit	9980b30
Author	@oanatmaria
Files changed	0
Review status	Completed
Comments	0
Duration	15s

Summary

📊 Review Score: 92/100 (overall code quality — 0 lowest, 100 highest)
⏱️ Estimated effort to review: 2/5 (1 = trivial, 5 = very complex)

🧪 Tests: no — No automated tests are included in the diff for the new Helm template logic. Consider adding helm-unittests or verifying with helm template --set global.registry=... to ensure the registry prefixing works correctly across all image references.

No significant issues found. LGTM! 🎉

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[kimchi-review]

📊 Review Score: 92/100 (overall code quality — 0 lowest, 100 highest)
⏱️ Estimated effort to review: 2/5 (1 = trivial, 5 = very complex)

🧪 Tests: no — No automated tests are included in the diff for the new Helm template logic. Consider adding helm-unittests or verifying with helm template --set global.registry=... to ensure the registry prefixing works correctly across all image references.

No significant issues found. LGTM! 🎉