Implement Black formatter

.github/workflows/black-formatter.yml

@@ -0,0 +1,20 @@
+name: Code Style
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+  schedule:
+    - cron: '0 12 * * 4'
+
+jobs:
+  black_formatter:
+    name: Black Formatter
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+
+      - uses: psf/black@stable
+        with:
+          options: "--check --verbose"

.github/workflows/codeql-analysis.yml

@@ -30,17 +30,12 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
       with:
         # We must fetch at least the immediate parents so that if this is
         # a pull request then we can checkout the head.
         fetch-depth: 2
 
-    # If this run was triggered by a pull request event, then checkout
-    # the head of the pull request instead of the merge commit.
-    - run: git checkout HEAD^2
-      if: ${{ github.event_name == 'pull_request' }}
-
     # Initializes the CodeQL tools for scanning.
     - name: Initialize CodeQL
       uses: github/codeql-action/init@v2