Added helm envFrom value parameter for cluster-name

[omerap12]

Issue

FIxes: #2729

Description

Add option to set the cluster name using envFrom.
for example, in values.yaml file:

envFrom: valueFrom: - secretRef: name: aws-load-balancer-controller clusterName: ${clusterName}

and then the deployment will get the cluterName using the env variable (which got from the secret).

Checklist

• Added tests that cover your change (if possible)
• Added/modified documentation as required (such as the README.md, or the docs directory)
• Manually tested
• Made sure the title of the PR is a good description that can go into the release notes

BONUS POINTS checklist: complete for good vibes and maybe prizes?! 🤯

• Backfilled missing tests for code in same general area 🎉
• Refactored something and made the world a better place 🌟

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[k8s-ci-robot]

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[googs1025]

/ok-to-test

[oliviassss]

/lgtm
can you please add an entry for the envFrom in values.yaml, with some comments for the example input. Thanks.

[omerap12]

/lgtm can you please add an entry for the envFrom in values.yaml, with some comments for the example input. Thanks.

sure. done :)

[oliviassss]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: oliviassss, omerap12

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