Add Python-C tests workflow

Author: jeromekelleher

.github/workflows/python-c-tests.yml

@@ -0,0 +1,52 @@
+name: Reusable Python C interface unit tests
+
+on:
+  workflow_call:
+    inputs:
+      additional-apt-packages:
+        description: 'Additional APT packages to install'
+        required: false
+        type: string
+        default: ''
+
+jobs:
+  c-tests:
+    name: Python-C unit tests
+    runs-on: ubuntu-24.04
+
+    steps:
+      - name: Cancel Previous Runs
+        uses: styfle/cancel-workflow-action@0.13.0
+        with:
+          access_token: ${{ github.token }}
+
+      - name: Checkout
+        uses: actions/checkout@v6.0.2
+        with:
+          submodules: true
+
+      - name: Install dev tools
+        run: sudo apt-get update && sudo apt-get install -y \
+          gcovr ${{ inputs.additional-apt-packages }}
+
+      - name: Install uv and set the python version
+        uses: astral-sh/setup-uv@v6
+        with:
+          python-version: 3.11
+          version: "0.8.15"
+
+      - name: Install Python dependencies
+        run: uv sync --locked --group test
+
+      - name: Build module
+        run: CFLAGS=--coverage uv run python setup.py build_ext --inplace
+
+      - name: Run low-level tests
+        run: uv run pytest -vs -n0 tests/test_lowlevel.py
+
+      - name: Upload coverage to Codecov
+        uses: codecov/codecov-action@v5.4.0
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
+          flags: c-python
+          fail_ci_if_error: true