Add native envFrom

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What does this MR do?

Add support for the native envFrom field.

Why was this MR needed?

Conveniently add cache configuration as environment variables from kubernetes secrets or configMaps.

What's the best way to test this MR?

Create a kubernetes secret with name/value and follow example in values.yaml.

What are the relevant issue numbers?

Replaces !363 (closed)
Replaces !520 (closed)