fix docs build error (#709)

.readthedocs.yaml

@@ -10,6 +10,8 @@ build:
   os: ubuntu-22.04
   tools:
     python: "3.10"
+  commands:
+    - git fetch --tags --unshallow || true
 
 # Build documentation in the docs/ directory with Sphinx
 sphinx:

rdagent/scenarios/qlib/docker/Dockerfile

@@ -21,3 +21,4 @@ RUN python -m pip install -e .
 RUN pip install catboost
 RUN pip install xgboost
 RUN pip install scipy==1.11.4
+RUN pip install tables