chore: add coverage test workflow

.github/workflows/coverage_test.yml

@@ -0,0 +1,33 @@
+name: Run tests and upload coverage
+
+on: 
+  push
+
+jobs:
+  test:
+    name: Run tests and collect coverage
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Write secret to file
+        run: mkdir data & echo "$CMD_CONFIG" > data/cmd_config.json
+        env:
+          MY_SECRET: ${{ secrets.CMD_CONFIG }}
+
+      - name: Set up Python
+        uses: actions/setup-python@v4
+
+      - name: Install dependencies
+        run: pip install pytest pytest-cov pytest-asyncio
+
+      - name: Run tests
+        run: PYTHONPATH=./ pytest --cov=. tests/ -v
+
+      - name: Upload results to Codecov
+        uses: codecov/codecov-action@v4
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}