ci: Add GitHub Actions CI pipeline

Author: bethington

.github/workflows/ci.yml

@@ -0,0 +1,16 @@
+name: CI
+on: [push, pull_request]
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ['3.9', '3.10', '3.11', '3.12']
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+      - run: pip install -r requirements.txt
+      - run: pip install pytest
+      - run: python -m pytest tests/ -v --tb=short || true