source scl devtoolset-8 in .bash_profile

Dockerfile

@@ -54,15 +54,16 @@ RUN yum update -y && \
     cmake --build build -- -j$(($(nproc) - 1)) && \
     cmake --build build --target install && \
     cd / && \
-    rm -rf /code
+    rm -rf /code && \
+    printf "\n# Make gcc v8.X default\nsource scl_source enable devtoolset-8\n" >> /root/.bash_profile
 
 ENV PYTHONPATH=/usr/local/root-cern/lib:$PYTHONPATH
 ENV LD_LIBRARY_PATH=/usr/local/root-cern/lib:$LD_LIBRARY_PATH
 ENV ROOTSYS=/usr/local/root-cern
 ENV PATH="${PATH}:${ROOTSYS}/bin"
 
+ENV HOME /root
 WORKDIR /home/data
-ENV HOME /home
 
 ENTRYPOINT ["/bin/bash", "-l", "-c"]
 CMD ["/bin/bash"]