Add ut test into CI (#11753)

### What problem does this PR solve?

As title

### Type of change

- [x] Other (please describe):

---------

Signed-off-by: Jin Hai <haijin.chn@gmail.com>

.github/workflows/tests.yml

@@ -127,6 +127,14 @@ jobs:
             fi
           fi
 
+      - name: Run unit test
+        run: |
+          uv sync --python 3.10 --group test --frozen
+          source .venv/bin/activate
+          which pytest || echo "pytest not in PATH"
+          echo "Start to run unit test"
+          python3 run_tests.py
+
       - name: Build ragflow:nightly
         run: |
           RUNNER_WORKSPACE_PREFIX=${RUNNER_WORKSPACE_PREFIX:-${HOME}}