Fix CI: Add proper Gitea Actions workflow configuration

ci.yml

@@ -0,0 +1,38 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    container: python:3.11-slim
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.11'
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install -e .
+          pip install ruff pytest mypy
+
+      - name: Run linting
+        run: ruff check .
+
+      - name: Run type check
+        run: mypy src/ --ignore-missing-imports || true
+
+      - name: Run tests
+        run: pytest tests/ -v