✨ Add CI workflow

.github/workflows/ci-workflow.yml

@@ -0,0 +1,39 @@
+name: CI Workflow
+
+on:
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up Python 3.11
+        uses: actions/setup-python@v4
+        with:
+          python-version: '3.11'
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install -r requirements-pyspark.txt
+
+      - name: Run unit tests with coverage
+        run: |
+          pytest tests/ \
+            --disable-warnings \
+            --cov=src \
+            --cov-config=.coveragerc \
+            --cov-report=html
+
+      - name: Upload coverage report
+        uses: actions/upload-artifact@v4
+        if: always()
+        with:
+          name: coverage-report
+          path: htmlcov/