Add GitHub actions runner

.github/workflows/main.yml

@@ -0,0 +1,31 @@
+name: Python Tests
+# Triggers on pushes/pull requests to 'master'.
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  test:
+    name: Test Python ${{ matrix.python-version }}
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false # Ensure all versions test even if one fails
+      matrix:
+        python-version: ['3.8', '3.9', '3.10', '3.11', '3.12', '3.13']
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v4
+
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v5
+      with:
+        python-version: ${{ matrix.python-version }}
+
+    - name: Install dependencies
+      run: python -m pip install --upgrade pip tox
+
+    - name: Run tests via tox
+      run: tox