Add test workflow

.github/workflows/tests.yaml

@@ -0,0 +1,30 @@
+name: Python package
+
+on:
+  workflow_dispatch:
+  push:
+    paths-ignore:
+      - docs/**
+  pull_request:
+    paths-ignore:
+      - docs/**
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ['3.8', '3.9', '3.10', '3.11']
+
+    steps:
+    - uses: actions/checkout@v3
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v4
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        python -m pip install tox tox-gh-actions
+    - name: Test with tox
+      run: tox