fix: CI without checkout step

.gitea/workflows/ci.yml

@@ -6,15 +6,12 @@ jobs:
   test:
     runs-on: ubuntu-latest
     steps:
-      - name: Checkout
-        uses: actions/checkout@v3
       - name: Setup Python
-        uses: actions/setup-python@v4
-        with:
-          python-version: '3.10'
-      - name: Install
         run: |
-          pip install -e .
-          pip install pytest
-      - name: Test
+          apt-get update && apt-get install -y python3 python3-pip
+      - name: Install dependencies
+        run: |
+          pip3 install -e .
+          pip3 install pytest
+      - name: Run tests
         run: pytest confsync/tests/ -v