add code-quality workflow

.github/workflows/code-quality.yml

@@ -0,0 +1,44 @@
+name: Test code quality
+
+on:
+  push:
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  code-quality:
+    runs-on: ubuntu-22.04
+
+    steps:
+      - uses: actions/checkout@v3
+
+      - 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: Cache dependencies
+        uses: actions/cache@v3
+        with:
+          path: ~/.cache/pip
+          key: ${{ runner.os }}-code-quality-${{ hashFiles('setup.cfg', 'setup.py') }}
+          restore-keys: |
+            ${{ runner.os }}-code-quality-
+
+      - name: Install required system packages only for Ubuntu Linux
+        run: |
+          sudo apt-get update
+          sudo apt-get -y upgrade
+          sudo apt-get install -y libsecp256k1-dev
+
+      - name: Install required Python packages
+        run: |
+          python3 -m pip install -e .
+          python3 -m pip install mypy ruff
+
+      - name: Test with ruff
+        run: |
+          ruff aleph_message
+
+      - name: Test with mypy
+        run: |
+          mypy aleph_message --check-untyped-defs