Simplify CI workflow using python container

.gitea/workflows/ci.yml

@@ -7,15 +7,15 @@ on:
 jobs:
   test:
     runs-on: ubuntu-latest
+    container:
+      image: python:3.11-slim
     steps:
-      - uses: actions/checkout@v4
-      - name: Set up Python
+      - name: Checkout
         run: |
-          sudo apt-get update
-          sudo apt-get install -y python3 python3-pip python3-venv
-          python3 --version
-          pip3 --version
-      - name: Install package
-        run: pip3 install -e . pytest pytest-asyncio
+          apt-get update
+          apt-get install -y git
+          git clone --depth 1 https://github.com/7000pctAUTO/snippet-manager.git .
+      - name: Install
+        run: pip install -e . pytest pytest-asyncio
       - name: Run tests
         run: pytest tests/ -v