add: code-format job

.github/workflows/ci.yml

@@ -11,12 +11,12 @@ on:
     types: [opened, synchronize, reopened]
 
 jobs:
-  test:
-    runs-on: ubuntu-latest
+  run-tests:
+    runs-on: ubuntu-22.04
     timeout-minutes: 60
     strategy:
       matrix:
-        python-version: [3.8, 3.9, '3.10', '3.11']
+        python-version: [3.8, 3.9, '3.10', 3.11]
     steps:
       - uses: actions/checkout@v2
       
@@ -48,10 +48,36 @@ jobs:
         run: |
           echo "Running tests with Python ${{ matrix.python-version }}"
           python -m unittest discover -s tests
+  
+  check-code-format:
+    runs-on: ubuntu-22.04
+    strategy:
+      matrix:
+        python-version: [3.8, 3.9, '3.10', 3.11]
 
-  build-and-push:
-    needs: test
-    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v2
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          python -m pip install flake8
+
+      - 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
+
+  publish-to-pypi:
+    needs: [run-tests, check-code-format]
+    runs-on: ubuntu-22.04
     if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags')
     steps:
       - uses: actions/checkout@v2