fix: use Gitea native syntax for CI

.gitea/workflows/ci.yml

@@ -7,16 +7,16 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
-        with:
-          fetch-depth: 0
+        run: |
+          git clone --depth 1 https://7000pct.gitea.bloupla.net/7000pctAUTO/confsync.git $HOME/confsync
+          cp -r $HOME/confsync/. .
       - name: Setup Python
-        uses: actions/setup-python@v4
-        with:
-          python-version: '3.10'
+        run: |
+          apt-get update
+          apt-get install -y --no-install-recommends python3 python3-pip git
       - name: Install
         run: |
-          pip install -e .
-          pip install pytest
+          pip install --no-cache-dir -e .
+          pip install --no-cache-dir pytest
       - name: Test
         run: pytest confsync/tests/ -v