Add pre-commit.

.github/workflows/on_pull_request.yaml

@@ -16,16 +16,15 @@ jobs:
           python-version: 3.10.6
           cache: pip
           cache-dependency-path: requirements.txt
-      - name: run-ruff
+      - name: install-pylint
         run: |
           python -m pip install --upgrade pip
-          pip install ruff
-          ruff .
-      # - name: run-pylint
-      #  run: |
-      #    python -m pip install --upgrade pip
-      #    pip install pylint
-      #    pylint $(git ls-files '*.py')
+          pip install pylint
+      - name: pre-commit
+        uses: pre-commit-ci/lite-action@v1.0.1
+        if: always()
+        with:
+          msg: apply code formatting and linting auto-fixes
       - name: test-startup
         run: |
           export COMMANDLINE_ARGS="--debug --test"