ci: run tests on branch pushes and PRs to main

.github/workflows/tests.yml

@@ -0,0 +1,33 @@
+name: Tests
+
+on:
+  push:
+    branches:
+      - '**'
+  pull_request:
+    branches:
+      - main
+
+permissions:
+  contents: read
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    timeout-minutes: 15
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v4
+
+      - name: Set up Python 3.10
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.10'
+          cache: pip
+          cache-dependency-path: requirements.txt
+
+      - name: Install dependencies
+        run: python -m pip install -r requirements.txt
+
+      - name: Run tests
+        run: make test

README.md

@@ -34,6 +34,9 @@ After installing the project dependencies, run the automated test suite:
 make test
 ```
 
+GitHub Actions runs the same suite with Python 3.10 on pushes to any branch and
+on pull requests targeting `main`.
+
 Override the Python interpreter if needed, for example `make test PYTHON=python3.11`.
 Or run test discovery directly: