GitHub Workflow to check any change on git repository and do something if any

workflow.yml

# https://docs.github.com/en/actions/using-workflows/workflow-commands-for-github-actions#environment-files
- name: Check if there is any change
  id: get_changes
  # deprecated. see https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/
  #run: echo "::set-output name=changed::$(git status --porcelain | wc -l)"
  run: echo "changed=$(git status --porcelain | wc -l)" >> $GITHUB_OUTPUT
- name: Do something if there is any change
  if: steps.get_changes.outputs.changed != 0
  run: do something