Create main.yml

.github/workflows/main.yml

@@ -0,0 +1,20 @@
+name: Format code
+on:
+  pull_request:
+jobs:
+  format:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - name: Format code with black
+        run: |
+          pip install black
+          black --line-length 120 .
+      - name: Commit changes
+        uses: EndBug/add-and-commit@v9
+        with:
+          default_author: github_actions
+          message: "Formatted code with black --line-length 120"
+          add: "."