[clang-tools-extra] [llvm] [Github][CI] Add `doc8` for clang-tidy documentation formatting (PR #168827)

[Baranov Victor via cfe-commits]

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@@ -94,6 +94,10 @@ COPY --from=llvm-downloader /llvm-extract/LLVM-${LLVM_VERSION}-Linux-X64/bin/cla
 COPY clang-tools-extra/clang-tidy/tool/clang-tidy-diff.py ${LLVM_SYSROOT}/bin/clang-tidy-diff.py
 
 # Install dependencies for 'pr-code-lint.yml' job
+RUN apt-get update && \
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vbvictor wrote:

Can we remove all modifications for Dockerfile and Ci files and leave only python script modification

https://github.com/llvm/llvm-project/pull/168827