Update Dockerfile generation instructions

Author: mc-nv

tools/gen_ort_dockerfile.py

@@ -373,33 +373,26 @@ def dockerfile_for_linux(output_file):
     cat /workspace/onnxruntime/cmake/external/onnx/VERSION_NUMBER > /opt/onnxruntime/ort_onnx_version.txt
 
 # ONNX Runtime headers, libraries and binaries
-RUN mkdir -p /opt/onnxruntime/include && \
-    cp /workspace/onnxruntime/include/onnxruntime/core/session/onnxruntime_c_api.h \
-       /opt/onnxruntime/include && \
-    cp /workspace/onnxruntime/include/onnxruntime/core/session/onnxruntime_session_options_config_keys.h \
-       /opt/onnxruntime/include && \
-    cp /workspace/onnxruntime/include/onnxruntime/core/providers/cpu/cpu_provider_factory.h \
-       /opt/onnxruntime/include \\
-    && /workspace/onnxruntime/include/onnxruntime/core/session/onnxruntime_ep_c_api.h /opt/onnxruntime/include
-
-RUN mkdir -p /opt/onnxruntime/lib && \
-    cp /workspace/build/${ONNXRUNTIME_BUILD_CONFIG}/libonnxruntime_providers_shared.so \
-       /opt/onnxruntime/lib && \
-    cp /workspace/build/${ONNXRUNTIME_BUILD_CONFIG}/libonnxruntime.so \
-       /opt/onnxruntime/lib
+WORKDIR /opt/onnxruntime/include
+RUN cp /workspace/onnxruntime/include/onnxruntime/core/session/onnxruntime_c_api.h . \\
+    && cp /workspace/onnxruntime/include/onnxruntime/core/session/onnxruntime_session_options_config_keys.h . \\
+    && cp /workspace/onnxruntime/include/onnxruntime/core/providers/cpu/cpu_provider_factory.h . \\
+    && cp /workspace/onnxruntime/include/onnxruntime/core/session/onnxruntime_ep_c_api.h .
+
+WORKDIR /opt/onnxruntime/lib
+RUN cp /workspace/build/${ONNXRUNTIME_BUILD_CONFIG}/libonnxruntime_providers_shared.so . \\
+    && cp /workspace/build/${ONNXRUNTIME_BUILD_CONFIG}/libonnxruntime.so .
 """
     if target_platform() == "igpu":
         df += """
 RUN mkdir -p /opt/onnxruntime/bin
 """
     else:
         df += """
-RUN mkdir -p /opt/onnxruntime/bin && \
-    cp /workspace/build/${ONNXRUNTIME_BUILD_CONFIG}/onnxruntime_perf_test \
-       /opt/onnxruntime/bin && \
-    cp /workspace/build/${ONNXRUNTIME_BUILD_CONFIG}/onnx_test_runner \
-       /opt/onnxruntime/bin && \
-    (cd /opt/onnxruntime/bin && chmod a+x *)
+WORKDIR /opt/onnxruntime/bin
+RUN cp /workspace/build/${ONNXRUNTIME_BUILD_CONFIG}/onnxruntime_perf_test . \\
+    && cp /workspace/build/${ONNXRUNTIME_BUILD_CONFIG}/onnx_test_runner . \\
+    && chmod a+x *
 """
 
     if FLAGS.enable_gpu: