Draft: feat: add native envFrom

• Please check this box if this contribution uses AI-generated content (including content generated by GitLab Duo features) as outlined in the GitLab DCO & CLA. As a benefit of being a GitLab Community Contributor, you receive complimentary access to GitLab Duo.

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?

Related !363 (closed)