✨ (helm/v2-alpha): Add manager.envOverrides for CLI env overrides

[camilamacedo86]

Charts define manager.env as a list to support Kubernetes env entries with valueFrom (e.g. fieldRef, secretKeyRef, etc.). The list format is required for operator defaults like RELATED_IMAGE_*, MEMORY_LIMIT_BYTES, WATCH_NAMESPACE, but it makes Helm CLI overrides painful because --set doesn’t target list items.

This PR adds manager.envOverrides (map) for install-time overrides/additions. The chart renders manager.env + manager.envOverrides, and when the same env var name exists in both, the override value wins.

Example:

helm install my-op ./dist/chart/ \
  --set manager.envOverrides.LOG_LEVEL=debug \
  --set manager.envOverrides.DEBUG=true

Closes: #5489

[camilamacedo86]

@asergeant01 @porridge

Could you please give a hand in this one?
Could you please review it?

[porridge]

@asergeant01 @porridge

Could you please give a hand in this one? Could you please review it?

Wow, thanks for the super fast turn around @camilamacedo86 ! I will be back in the office on Tuesday and should be able to take a look then.

[asergeant01]

Looks good from my side

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: asergeant01, camilamacedo86

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