...:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v2
      # .....................
      # Make changes to files
      # .....................
      - name: Run Find changed files.
        id: changed_files
        uses: jackton1/[email protected]
        with:
          files: "test.png, new.txt, test_directory"
      - name: Perform action when files change.
        if: steps.changed_files.outputs.files_changed == 'true'
        run: |
          echo "Do something when files have changed."