Replace deprecated command with environment file

[jongwooo]

Proposed changes

Resolve #3575

Update .github/workflows/issues.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=text::$text"

TO-BE

echo "text=$text" >> $GITHUB_OUTPUT

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING doc
• I have added tests that prove my fix is effective or that my feature works
• I have checked that all unit tests pass after adding my changes
• I have updated necessary documentation
• I have rebased my branch onto main
• I will ensure my PR is targeting the main branch and pulling from my branch from my own fork

[lucacome]

Thanks @jongwooo !

[codecov-commenter]

Codecov Report

Merging #3576 (7079ad9) into main (14ebdc4) will decrease coverage by 0.03%.
The diff coverage is n/a.

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@@            Coverage Diff             @@
##             main    #3576      +/-   ##
==========================================
- Coverage   52.32%   52.29%   -0.03%     
==========================================
  Files          59       59              
  Lines       16849    16849              
==========================================
- Hits         8816     8812       -4     
- Misses       7738     7740       +2     
- Partials      295      297       +2     

Impacted Files	Coverage Δ
internal/k8s/configuration.go	95.43% <0.00%> (-0.37%)	⬇️

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