[Output variable] List of specific file changes

[LangLangBart]

description

• the README states to open a new issue for more Output Variables
• could you provide a variable to see what kind of files have been changed

use case

• I would like to check if the list of new commits includes '.cpp' files

# example with a made up variable called 'file_changes_include'
    - name: New commits found and it includes '.cpp' changes
      if: |
        (steps.sync.outputs.has_new_commits == 'true' &&
        steps.sync.outputs.file_changes_include == '*cpp*')
      run: |
        echo "New commits were found to sync."
        make

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PS: The action works very well, a good job of you to make it available to the public.