fix(update): don't do anything if nothing has changed

{{ cookiecutter.project_slug }}/.github/workflows/update.yml

@@ -19,17 +19,27 @@ jobs:
       - name: Update project structure
         run: |
           cruft update -y
+
+      - name: Check if there are changes
+        id: changes
+        uses: UnicornGlobal/[email protected]
+
+      - name: apply additional changes and fixes
+        if: steps.changes.outputs.changed == 1
+        run: |
           poetry lock --no-update  # add new dependencies
           poetry install
           poetry run pre-commit run -a || true  # we have to fix other issue manually
 
       - name: Get new template version
+        if: steps.changes.outputs.changed == 1
         # extract new cooiecutter template version
         run: |
           echo "TEMPLATE_COMMIT=$(cat .cruft.json | jello -r "_['commit'][:8]")" >> $GITHUB_ENV
 
       # behaviour if PR already exists: https://github.com/marketplace/actions/create-pull-request#action-behaviour
       - name: Create Pull Request
+        if: steps.changes.outputs.changed == 1
         uses: peter-evans/create-pull-request@v3
         with:
           token: ${{ secrets.AUTO_UPDATE_GITHUB_TOKEN }}
@@ -39,4 +49,4 @@ jobs:
           body: ""
           branch: chore/cookiecutter-pypackage
           delete-branch: true
-{% endraw %}
+{% endraw %}