Add format.yml workflow

.github/workflows/format.yml

@@ -0,0 +1,31 @@
+name: Format
+
+on: [push]
+
+jobs:
+  format:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: [3.12.x]
+
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Run Python code formatting with Ruff
+        uses: chartboost/ruff-action@main
+        with:
+          args: "format --exclude src/trading_portfolio_tracker/ui"
+
+      - name: Commit changes made by Ruff
+        uses: stefanzweifel/git-auto-commit-action@master
+        with:
+          commit_message: Format Python code with Ruff
+
+      - name: Switch to current branch
+        run: git checkout ${{ env.BRANCH }}
+
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@main
+        with:
+          python-version: ${{ matrix.python-version }}