Replace deprecated command with environment file

[jongwooo]

Description

Resolve #132

Update .github/workflows/chart-lint-test.yml 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 file 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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/lifecycle stale

[jongwooo]

/remove-lifecycle stale

[kvaps]

/lgtm

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This pull-request has been approved by: jongwooo, kvaps

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