Add pytest-cov dependency and dedicated coverage CI job with artifact upload

Author: Copilot

.github/workflows/CI.yml

@@ -203,6 +203,28 @@ jobs:
           pip install pytest
           pytest
 
+  coverage:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+      - name: Build and install package
+        uses: PyO3/maturin-action@v1
+        with:
+          command: develop
+          args: --release
+      - name: Install test dependencies
+        run: pip install -e ".[test]"
+      - name: Run coverage
+        run: pytest --cov=e57 --cov-report=term-missing --cov-report=xml
+      - name: Upload coverage artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: coverage-xml
+          path: coverage.xml
+
   sdist:
     runs-on: ubuntu-latest
     steps:

pyproject.toml

@@ -26,6 +26,7 @@ classifiers = [
 [project.optional-dependencies]
 test = [
     'pytest>=9,<10',
+    'pytest-cov>=5,<7',
 ]
 
 [project.urls]