Add original Docker image, using run-clang-format.py

.gitmodules

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+[submodule "run-clang-format"]
+	path = run-clang-format
+	url = https://github.com/Sarcasm/run-clang-format

Dockerfile

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+FROM ubuntu:19.04
+
+RUN apt update && apt-get install -y --no-install-recommends \
+	clang-format python3 \
+        && rm -rf /var/lib/apt/lists/*
+
+ADD run-clang-format/run-clang-format.py /usr/bin
+
+RUN mkdir /src
+WORKDIR /src
+ENTRYPOINT ["run-clang-format.py", "-r", "."]
+

run-clang-format

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+Subproject commit 50fc7ad73e596225955fe90226ee7870b28febf2