Fix: Code quality was not tested

.github/workflows/code-quality.yml

@@ -0,0 +1,56 @@
+name: Test code quality
+
+on:
+  push:
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  code-quality:
+    runs-on: ubuntu-22.04
+
+    strategy:
+      matrix:
+        python-version: [ "3.9", "3.10", "3.11", "3.12" ]
+
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Workaround github issue https://github.com/actions/runner-images/issues/7192
+        run: sudo echo RESET grub-efi/install_devices | sudo debconf-communicate grub-pc
+
+      - name: Install pip and hatch
+        run: |
+          sudo apt-get install -y python3-pip
+          pip3 install hatch
+
+      - name: Cache dependencies
+        uses: actions/cache@v4
+        with:
+          path: ~/.cache/pip
+          key: ${{ runner.os }}-code-quality-${{ hashFiles('pyproject.toml') }}
+          restore-keys: |
+            ${{ runner.os }}-code-quality-
+
+      - name: Install required system packages only for Ubuntu Linux
+        run: sudo apt-get install -y libsecp256k1-dev
+
+      - name: Install required Python packages
+        run: |
+          pip3 install black isort ruff mypy
+
+      - name: Black
+        run: black --check src tests
+
+      - name: Isort
+        run: isort --check src tests
+
+      - name: Ruff
+        run: ruff check src tests
+
+      - name: Mypy
+        run: mypy src tests