chore: add CI runner (pyserial#2)

.github/workflows/ci.yaml

@@ -0,0 +1,29 @@
+name: CI
+
+on:
+  - push
+  - pull_request
+
+jobs:
+  coverage:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        python-version: [3.9, "3.10", "3.11"]
+
+    steps:
+    - uses: actions/checkout@v3
+    - name: Set up Python
+      uses: actions/setup-python@v4
+      with:
+        python-version: ${{ matrix.python-version }}
+        cache: "pip"
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install -r requirements_dev.txt .
+    - name: Tests
+      run: pytest --cov-report term-missing --cov-report=xml test
+    - name: Upload coverage to Codecov
+      uses: codecov/codecov-action@v3

requirements_dev.txt

@@ -0,0 +1,2 @@
+pytest-cov
+pytest-asyncio