ci: add parallel test execution and nightly Docker E2E job

.github/workflows/ci.yml

@@ -5,6 +5,9 @@ on:
     branches: [main, "feature/**"]
   pull_request:
     branches: [main]
+  schedule:
+    - cron: "0 3 * * *"  # Nightly at 03:00 UTC — runs docker-e2e
+  workflow_dispatch:
 
 jobs:
   test:
@@ -22,8 +25,8 @@ jobs:
       - name: Install dependencies
         run: uv pip install --system ".[dev]"
 
-      - name: Run tests
-        run: pytest tests/ -v --tb=short
+      - name: Run tests (parallel)
+        run: pytest tests/ -v --tb=short -n auto
         env:
           TESTING: "1"
 
@@ -34,3 +37,32 @@ jobs:
 
       - name: Build Docker image
         run: docker build -t data-analyst:test .
+
+  docker-e2e:
+    runs-on: ubuntu-latest
+    if: github.event_name == 'schedule' || github.event_name == 'workflow_dispatch'
+    needs: docker-build
+    steps:
+      - uses: actions/checkout@v5
+
+      - uses: actions/setup-python@v6
+        with:
+          python-version: "3.13"
+
+      - name: Install uv
+        uses: astral-sh/setup-uv@v7
+
+      - name: Install dependencies
+        run: uv pip install --system ".[dev]"
+
+      - name: Start services
+        run: docker compose up -d --wait --wait-timeout 60
+
+      - name: Run Docker E2E tests
+        run: pytest tests/ -v --tb=short -m docker --timeout=120
+        env:
+          TESTING: "1"
+
+      - name: Stop services
+        if: always()
+        run: docker compose down