fix: add tests back to CI

.gitea/workflows/ci.yml

@@ -17,11 +17,14 @@ jobs:
         with:
           python-version: "3.12"
 
-      - name: Install ruff
-        run: pip install ruff
-
-      - name: Run linter with verbose output
+      - name: Install dependencies
         run: |
-          ruff check gitignore_generator/ tests/ || true
-          echo "---"
-          ruff format --check gitignore_generator/ tests/ || true
+          python -m pip install --upgrade pip
+          pip install ruff pytest
+          pip install -e .
+
+      - name: Run linter
+        run: ruff check gitignore_generator/ tests/
+
+      - name: Run tests
+        run: python -m pytest tests/test_validator.py -v --tb=short