Add GitHub Actions workflows for tests and linting

.github/workflows/tests.yaml

@@ -0,0 +1,61 @@
+name: Tests
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  tests:
+
+    runs-on: ${{ matrix.operating-system }}
+    strategy:
+      matrix:
+        operating-system: [ubuntu-latest, windows-latest]
+        python-version: ["3.11"]
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v2
+
+    - name: Set up Python
+      uses: actions/setup-python@v2
+      with:
+        python-version: ${{ matrix.python-version }}
+
+    - name: Install dependencies
+      run: |
+        pip install --upgrade pip
+        pip install poetry=1.7
+        poetry install --with dev
+
+    - name: Run tests
+      run: poetry run pytest -v
+
+  lint:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v2
+
+    - name: Set up Python
+      uses: actions/setup-python@v2
+      with:
+        python-version: 3.11
+
+    - name: Install dependencies
+      run: |
+        pip install --upgrade pip
+        pip install poetry==1.7
+        poetry install
+
+    - name: Run flake8
+      run: |
+        poetry run flake8
+
+    - name: Run mypy
+      run: |
+        poetry run mypy