Added toolchain and Dockerfile

src/build_scripts/openvino/riscv-64/Dockerfile

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+FROM ubuntu:22.04
+USER root
+WORKDIR /
+
+# Install Packages
+RUN apt update && apt upgrade -y && apt install -y \
+    apt-utils autoconf automake build-essential curl nano fdupes \
+    git ca-certificates crossbuild-essential-riscv64 \
+    gcc-riscv64-linux-gnu g++-riscv64-linux-gnu \
+    gcc g++ python3 python3-pip python3-venv python3-dev && \
+    rm -rf /var/lib/apt/lists/*
+
+# Install RISC-V packages
+RUN dpkg --add-architecture riscv64 && \
+    sed -i -E 's|^deb ([^ ]+) (.*)$|deb [arch=amd64] \1 \2\ndeb [arch=riscv64] http://ports.ubuntu.com/ubuntu-ports/ \2|' /etc/apt/sources.list && \
+    apt update -y && apt install -y --no-install-recommends libpython3-dev:riscv64
+
+# Install cmake
+RUN python3 -m pip install --upgrade pip && python3 -m pip install cmake
+
+# Clone openvino
+RUN git clone https://github.com/openvinotoolkit/openvino.git --branch 2023.2.0
+WORKDIR /openvino
+RUN git submodule update --init \
+        ./thirdparty/pugixml \
+        ./thirdparty/ade \
+        ./thirdparty/gflags/gflags \
+        ./thirdparty/protobuf \
+        ./thirdparty/json/nlohmann_json \
+        ./thirdparty/flatbuffers/flatbuffers \
+        ./thirdparty/onnx/onnx \
+        ./thirdparty/snappy \
+        ./thirdparty/zlib \
+        ./thirdparty/open_model_zoo \
+        ./src/plugins/intel_cpu/thirdparty/onednn \
+        ./src/bindings/python/thirdparty/pybind11
+
+# Copy CMake toolchain
+COPY riscv64.toolchain.cmake ./cmake/toolchains/custom_riscv64.toolchain.cmake
+
+## Build OpenVINO
+RUN python3 -m pip install -r ./src/bindings/python/wheel/requirements-dev.txt
+RUN python3 -m pip install -r ./src/bindings/python/src/compatibility/openvino/requirements-dev.txt
+RUN mkdir build && cd build && \
+    cmake .. -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=../../openvino_riscv64_gnu -DCMAKE_TOOLCHAIN_FILE=../cmake/toolchains/custom_riscv64.toolchain.cmake \
+    -DENABLE_INTEL_CPU=ON -DENABLE_INTEL_GPU=OFF -DENABLE_INTEL_GNA=OFF -DENABLE_MULTI=OFF -DENABLE_AUTO=OFF -DENABLE_HETERO=OFF \
+    -DENABLE_PYTHON=ON -DPYTHON_MODULE_EXTENSION=$(riscv64-linux-gnu-python3-config --extension-suffix) \
+    -DPYBIND11_PYTHON_EXECUTABLE_LAST=/usr/bin/python3.10 -DENABLE_PYTHON_PACKAGING=ON && \
+    make install -j $(proc)
+RUN rm -rf ./build
+WORKDIR /

src/build_scripts/openvino/riscv-64/riscv64.toolchain.cmake

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+set(CMAKE_SYSTEM_NAME Linux)
+set(CMAKE_SYSTEM_PROCESSOR riscv64)
+
+set(CMAKE_C_COMPILER riscv64-linux-gnu-gcc)
+set(CMAKE_CXX_COMPILER riscv64-linux-gnu-g++)
+set(CMAKE_STRIP riscv64-linux-gnu-strip)
+set(PKG_CONFIG_EXECUTABLE riscv64-linux-gnu-pkg-config CACHE PATH "Path to RISC-V pkg-config")