fix: add dependencies step

.gitea/workflows/ci.yml

@@ -6,5 +6,19 @@ jobs:
   test:
     runs-on: ubuntu-latest
     steps:
-      - name: Test Python
+      - name: Checkout
+        run: |
+          git clone https://${{ gitea.server }}/${{ gitea.repository }} .
+          git checkout ${{ gitea.sha }}
+
+      - name: Python version
         run: python3 --version
+
+      - name: Install deps
+        run: |
+          python3 -m pip install --upgrade pip
+          python3 -m pip install pytest ruff
+          python3 -m pip install -e ".[dev]"
+
+      - name: Test
+        run: python3 -m pytest tests/ -v --tb=short