Add GitHub workflows to automate PyPI releases

.github/workflows/pypi-deploy.yml

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+name: pypi-deploy
+
+on:
+  release:
+    types: [published]
+
+jobs:
+  deploy:
+    name: Build and deploy the package to PyPI
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Python 3.9
+      uses: actions/setup-python@v2
+      with:
+        python-version: "3.9"
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install --upgrade build
+        pip install --upgrade twine
+    - name: Build package
+      run: |
+        python -m build --outdir dist/
+        twine check dist/*
+    - name: Publish package
+      uses: pypa/gh-action-pypi-publish@master
+      with:
+        user: __token__
+        password: ${{ secrets.PYPI_API_TOKEN }}
+        verbose: true

.github/workflows/tests.yml

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+name: tests
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build-n-test:
+    name: Install and test the package
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Python 3.9
+      uses: actions/setup-python@v2
+      with:
+        python-version: "3.9"
+    - name: Install the package locally
+      run: |
+        python -m pip install --upgrade pip
+        pip install .
+    - name: Install dependencies for testing
+      run: |
+        pip install pytest-cov
+        pip install black
+    - name: Test with pytest
+      run: |
+        pytest --cov
+    - name: Check code format
+      run: |
+        black --check .