feat(chart): add extra containers

[subbuv26]

Summary

Adds an optional extraContainers and extraInitContainers in the helm chart, to support sidecar containers. Default is empty.

Addresses issue: #3054

Summary by CodeRabbit

• New Features
  • Added Helm chart configuration options for injecting additional sidecar containers and init containers into application pods.
  • Added schema validation and documentation for the new container configuration options.
  • Additional init containers are supported alongside embedded database initialization when applicable.

[CLAassistant]

All committers have signed the CLA.

[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 Plus

Run ID: 7477d386-7d0b-4410-8175-ab1b2136de59

📥 Commits

Reviewing files that changed from the base of the PR and between fb8e883 and 24ff3c9.

📒 Files selected for processing (4)

• chart/README.md
• chart/templates/deployment.yaml
• chart/values.schema.json
• chart/values.yaml

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Walkthrough

Changes

Pod container extensions

Layer / File(s)	Summary
Container configuration contracts chart/values.yaml, chart/values.schema.json, chart/README.md	Defines and documents extraContainers and extraInitContainers as optional Kubernetes container arrays with empty defaults.
Pod template rendering chart/templates/deployment.yaml	Renders extra init containers and sidecar containers into the workload pod while retaining the existing embedded database permissions condition.

Sequence Diagram(s)

sequenceDiagram
  participant HelmValues
  participant DeploymentTemplate
  participant KubernetesPod
  HelmValues->>DeploymentTemplate: Provide extraContainers and extraInitContainers
  DeploymentTemplate->>KubernetesPod: Render additional containers into the pod spec

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Suggested reviewers: adityathebe

🚥 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 summarizes the main change: adding extra container support to the chart.
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

✨ Simplify code

• Create PR with simplified code

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