Merge branch 'clang-format-12.0.1' into 'master'

[ci] Updated clang-format to 12.0.1.

See merge request ogs/ogs!3731

scripts/docker/Dockerfile.pre-commit

@@ -4,7 +4,12 @@ ENV TZ=Europe/Berlin
 RUN ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone
 
 RUN apt-get update \
-    && apt-get install -y --no-install-recommends git gcc g++ python3-pip clang-format-12 \
+    && apt-get install -y --no-install-recommends git gcc g++ python3-pip wget xz-utils \
     && rm -rf /var/lib/apt/lists/*
-RUN update-alternatives --install /usr/local/bin/clang-format clang-format /usr/bin/clang-format-12 10
 RUN pip install pre-commit==2.13.0
+
+ARG clang_version=12.0.1
+RUN wget https://github.com/llvm/llvm-project/releases/download/llvmorg-${clang_version}/clang+llvm-${clang_version}-x86_64-linux-gnu-ubuntu-16.04.tar.xz \
+    && tar xf clang+llvm-${clang_version}-x86_64-linux-gnu-ubuntu-16.04.tar.xz \
+    && rm clang+llvm-${clang_version}-x86_64-linux-gnu-ubuntu-16.04.tar.xz
+ENV PATH="/clang+llvm-${clang_version}-x86_64-linux-gnu-ubuntu-/bin:${PATH}"