[sophora-youtube-connector] ExtraEnvVarsSecret replaced with envFrom

[boossubshell]

No description provided.

[Copilot]

🟡 Changes recommended

The test values render invalid Kubernetes envFrom entries, and the breaking configuration migration remains inconsistently documented and versioned.

3 open findings

• Wrap envFrom source fields in secretRef or configMapRef · New
• Preserve renamed values keys or release as a major version · New
• Update README example to use the new envFrom structure · New

What changed in this PR

Replaces secret-specific environment configuration with Kubernetes envFrom support.

Changes:

• Adds envFrom values and StatefulSet rendering.
• Updates test values and chart release metadata.
• Documents the change in the changelog.

File	Description
values.yaml	Adds envFrom defaults.
test-values.yaml	Migrates example environment sources.
templates/​statefulset.yaml	Renders envFrom for both containers.
Chart.yaml	Updates version and Artifact Hub annotation.
CHANGELOG.md	Records the configuration change.

🧠 Review effort: Balanced

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