Replace set-output by $GITHUB_ENV

[Yury-Fridlyand]

Hi

lychee-action/entrypoint.sh

Line 51 in 2e991c5

echo ::set-output name=exit_code::$exit_code

set-output function of GHA is deprecated. https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/
It is recommended to use Environment files instead. An example from GHA docs:

steps:
  - name: Set the value
    id: step_one
    run: |
      echo "action_state=yellow" >> $GITHUB_ENV
  - name: Use the value
    id: step_two
    run: |
      echo "${{ env.action_state }}" # This will output 'yellow'

[Yury-Fridlyand]

I can do a PR with the fix, but I'd like to have a confirmation first.

[mre]

Oh that's great news because the current syntax is pretty awful. I'd be thankful for a pull request.