feat(chart): support envFrom

[farodin91]

What does it do ?

Motivation

More

• Yes, this PR title follows Conventional Commits
• Yes, I added unit tests
• Yes, I updated end user documentation accordingly

[k8s-ci-robot]

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[ivankatliarchuk]

Pls review past/closed PRs

[farodin91]

@ivankatliarchuk I would to use it for coredns as uses mainly ENVs to configure etcd connection.