sst-integration: add python for gpu app

Dockerfile

@@ -36,6 +36,7 @@ RUN git clone https://github.com/riscv-collab/riscv-gnu-toolchain.git \
 && rm -rf riscv-gnu-toolchain
 
 # Setup GPU app collection in SST mode
+RUN apt-get update && apt-get install python3 python2
 RUN export PATH=$CUDA_INSTALL_PATH/bin:$PATH \
 && cd gpu-app-collection \
 && make clean -C ./src \