revert: replace flake8 with Ruff linter and formatter

Author: ilypopv

.github/workflows/python-package.yml

@@ -1,41 +1,46 @@
 # This workflow will install Python dependencies, run tests and lint with a variety of Python versions
 # For more information see: https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-python
+
 name: Python package
+
 on:
   push:
     branches: [ "dev", "main" ]
   pull_request:
     branches: [ "dev", "main" ]
+
 jobs:
   build:
+
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false
       matrix:
         python-version: ["3.10", "3.11", "3.12", "3.13", "3.14"]
+
     steps:
-      - uses: actions/checkout@v4
-      - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v5
-        with:
-          python-version: ${{ matrix.python-version }}
-      - name: Install dependencies
-        run: |
-          python -m pip install --upgrade pip
-          python -m pip install ruff setuptools wheel
-          pip install -e ".[dev]" --no-build-isolation
-      - name: Lint with Ruff
-        run: |
-          ruff check .
-      - name: Format check with Ruff
-        run: |
-          ruff format --check .
-      - name: Test with pytest
-        run: |
-          pytest --cov=krakenparser --cov-report=xml
-      - name: Upload coverage to Codecov
-        if: matrix.python-version == '3.12'
-        uses: codecov/codecov-action@v5
-        with:
-          files: coverage.xml
-          token: ${{ secrets.CODECOV_TOKEN }}
+    - uses: actions/checkout@v4
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v5
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        python -m pip install flake8 setuptools wheel
+        pip install -e ".[dev]" --no-build-isolation
+    - name: Lint with flake8
+      run: |
+        # stop the build if there are Python syntax errors or undefined names
+        flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
+        # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
+        flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
+    - name: Test with pytest
+      run: |
+        pytest --cov=krakenparser --cov-report=xml
+    - name: Upload coverage to Codecov
+      if: matrix.python-version == '3.12'
+      uses: codecov/codecov-action@v5
+      with:
+        files: coverage.xml
+        token: ${{ secrets.CODECOV_TOKEN }}