Add Dockerfiles to run tests against different clang versions

dockerfiles/Dockerfile-bindgen

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+ARG	LLVM_VERSION=13
+
+FROM clang:${LLVM_VERSION}-ubuntu
+
+RUN	curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --default-toolchain nightly
+
+COPY	.	/project
+WORKDIR	/project
+
+CMD	["/root/.cargo/bin/cargo", "test", "-p", "bindgen-tests", "--features", "__testing_only_extra_assertions"]

dockerfiles/Dockerfile-clang

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+FROM ubuntu:jammy
+
+ENV	DEBIAN_FRONTEND	noninteractive
+
+ARG	LLVM_VERSION=13
+
+RUN	apt-get update && apt-get install -y \
+	wget \
+	curl \
+	gnupg \
+	build-essential \
+	&& wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | gpg --dearmor | tee /usr/share/keyrings/llvm-archive-keyring.gpg > /dev/null \
+	&& echo "deb [signed-by=/usr/share/keyrings/llvm-archive-keyring.gpg] https://apt.llvm.org/jammy/ llvm-toolchain-jammy-${LLVM_VERSION} main" > /etc/apt/sources.list.d/llvm.list \
+	&& apt-get update && apt-get install -y \
+	clang-${LLVM_VERSION} \
+	libclang-${LLVM_VERSION}-dev

dockerfiles/README.md

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+# Dockerfiles for running cargo test on bindgen-tests
+
+## Dockerfile-clang
+
+LLVM_VERSION can be [13, 18] and correspond to the packages at [apt.llvm.org](https://apt.llvm.org/) for Ubuntu 22.04
+
+From the `rust-bingen` repo,
+
+```
+docker build dockerfiles -f dockerfiles/Dockerfile-clang -t clang:14-ubuntu --build-arg LLVM_VERSION=14
+```
+
+## Dockerfile-bindgen
+
+From the `rust-bindgen` repo,
+
+```
+docker build . -f dockerfiles/Dockerfile-bindgen -t bindgen:clang-14-ubuntu --build-arg LLVM_VERSION=14
+```
+
+## Make changes to the repo happen in the docker container
+
+```
+docker run -v .:/project bindgen:clang-14-ubuntu
+```
+
+To pass an environment variable to the container
+
+```
+docker run -v .:/project -e BINDGEN_OVERWRITE_EXPECTED=1 bindgen:clang-14-ubuntu
+```