[Dockerfile] add file

Dockerfile

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+FROM ubuntu:20.04
+
+WORKDIR /clang-bind
+COPY . .
+
+RUN apt-get update && apt-get install -y python3-pip build-essential wget
+
+RUN wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | apt-key add -
+RUN echo 'deb http://apt.llvm.org/focal/ llvm-toolchain-focal-12 main' | tee -a /etc/apt/sources.list
+RUN echo 'deb-src http://apt.llvm.org/focal/ llvm-toolchain-focal-12 main' | tee -a /etc/apt/sources.list
+RUN apt-get install -y libclang-12-dev python3-clang-12
+
+RUN pip install -r requirements.txt
+
+ENTRYPOINT [ "bash" ]