Add symlink python3->python

Dockerfile

@@ -44,6 +44,8 @@ RUN python3.9 -m pip --no-cache-dir install -U pip setuptools  && \
 ENV GW_SURROGATE=/usr/lib64/python3.9/site-packages/gwsurrogate
 ENV CUPY_CACHE_IN_MEMORY=1
 
+RUN ln -s /usr/bin/python3 /usr/bin/python
+
 # Environment setup
 COPY entrypoint/bashrc /root/.bashrc
 COPY entrypoint/docker-entrypoint.sh /docker-entrypoint.sh