initial workflow for CI (pytest)

.github/workflows/ci.yml

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+name: Python CI
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+permissions:
+  contents: read
+
+jobs:
+  test:
+    name: Run Tests
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ['3.11', '3.13'] # the one we have in the Codespace + the latest supported one by PyO3.
+      fail-fast: false  # Continue testing other version(s) if one fails
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v5
+
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v6
+      with:
+        python-version: ${{ matrix.python-version }}
+        cache: 'pip'
+
+    - name: Install dependencies
+      run: |
+        python -m venv .venv
+        source .venv/bin/activate
+        python -m pip install --upgrade pip
+        python -m pip install -r requirements.txt
+        python -m pip install -r requirements-test.txt
+
+    - name: Run tests with pytest
+      run: |
+        source .venv/bin/activate
+        pytest tests/ -v
+      env:
+        PYTHONPATH: ${{ github.workspace }}