ci: add pytest workflow with coverage

Author: chanshing

.github/workflows/pytest.yaml

@@ -0,0 +1,35 @@
+name: pytest
+
+on:
+  push:
+    branches:
+      - '**'
+  pull_request:
+
+jobs:
+  pytest:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ["3.8", "3.9", "3.10"]
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup python
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+          cache: 'pip'
+          cache-dependency-path: setup.py
+
+      - name: Install dependencies
+        run: |
+          set -e
+          pip install --upgrade pip
+          pip install -e .[dev]
+
+      - name: Run tests with coverage
+        run: |
+          set -e
+          python -m pytest --cov --cov-report=term-missing --cov-report=xml