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)
• [x] Added/modified documentation as required (such as the README.md, or the docs directory)
• [x] 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?! :exploding_head:

• [ ] Backfilled missing tests for code in same general area :tada:
• [ ] Refactored something and made the world a better place :star2:

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @omerap12. Thanks for your PR.

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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

The full list of commands accepted by this bot can be found here.

The pull request process is described here

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