Replace deprecated command with environment file

[jongwooo]

Description

Resolve #1172

Update .github/workflows/helm.yaml to use environment file instead of deprecated set-output command.
For more information, see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/

I found the workflow files that use set-output command through the following command:

$ find . -name '*.yml' -o -name '*.yaml' | xargs egrep '\bset-output\b'

AS-IS

echo "::set-output name=changed::true"

TO-BE

echo "changed=true" >> $GITHUB_OUTPUT

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[k8s-ci-robot]

Hi @jongwooo. Thanks for your PR.

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[a7i]

/ok-to-test

[damemi]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: damemi

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[a7i]

/lgtm

Thank you @jongwooo 🏆