Feat: replace deprecated command with environment file

[jongwooo]

Description of your changes

Closes #180

Update workflows 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=TAG::latest

TO-BE

echo "TAG=latest" >> $GITHUB_OUTPUT

I have:

• Read and followed KubeVela's contribution process.
• Related Docs updated properly. In a new feature or configuration option, an update to the documentation is necessary.
• Run make reviewable to ensure this PR is ready for review.
• Added backport release-x.y labels to auto-backport this PR if necessary.

How has this code been tested

None

Special notes for your reviewer

None

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (7d88eef) 66.76% compared to head (e6bff7a) 66.76%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #181   +/-   ##
=======================================
  Coverage   66.76%   66.76%           
=======================================
  Files          50       50           
  Lines        4553     4553           
=======================================
  Hits         3040     3040           
  Misses       1108     1108           
  Partials      405      405           

Flag	Coverage Δ
e2etests	22.14% <ø> (ø)
unit-test	64.27% <ø> (ø)

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