Make use of venv

Author: mreso

docker/Dockerfile.dev

@@ -65,8 +65,10 @@ RUN if [ "$MACHINE_TYPE" = "gpu" ]; then export USE_CUDA=1; fi \
     && git clone https://github.com/pytorch/serve.git \
     && cd serve \
     && git checkout ${BRANCH_NAME} \
-    && python$PYTHON_VERSION -m venv /home/venv \
-    && python -m pip install -U pip setuptools \
+    && python$PYTHON_VERSION -m venv /home/venv
+ENV PATH="/home/venv/bin:$PATH"
+WORKDIR serve
+RUN python -m pip install -U pip setuptools \
     && if [ -z "$CUDA_VERSION" ]; then python ts_scripts/install_dependencies.py --environment=dev; else python ts_scripts/install_dependencies.py --environment=dev  --cuda $CUDA_VERSION; fi \
     && if [ "$BUILD_WITH_IPEX" = "true" ]; then python -m pip install --no-cache-dir intel_extension_for_pytorch==${IPEX_VERSION} -f ${IPEX_URL}; fi \
     && python ts_scripts/install_from_src.py \