fix dependency

Dockerfile

@@ -10,9 +10,7 @@ RUN sed -i 's http://deb.debian.org http://cdn-aws.deb.debian.org g' /etc/apt/so
 
 RUN pip install --no-cache-dir Cython "gradio==3.28.3" "torch==1.10.1"
 
-RUN git clone --recurse-submodules https://github.com/thu-coai/DA-Transformer.git && cd DA-Transformer && git checkout demo && pip install -e .
-
-RUN cd dag_search && python3 setup.py build_ext --inplace && pip install -e . && cd ../..
+RUN git clone --recurse-submodules https://github.com/thu-coai/DA-Transformer.git && cd DA-Transformer && git checkout demo && pip install -e . && cd dag_search && python3 setup.py build_ext --inplace && pip install -e . && cd ../..
 
 USER user