Added Alpine and Ubuntu 22.04 docker build configs

Docker/Test-Build-Alpine.docker

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+# Using Ubuntu 20.04 seems to be simplest way to get an LLVM-11 that works
+FROM alpine:latest
+RUN apk add build-base llvm14-dev clang14-dev llvm14-static clang14-static cmake make diffutils
+
+# Copy the source into the Docker container
+RUN mkdir -p /c2ffi
+COPY / /c2ffi
+WORKDIR /c2ffi
+
+# Build c2ffi
+RUN cd /c2ffi && \
+        rm -rf build && mkdir -p build && cd build && \
+        cmake -DBUILD_CONFIG=Release .. && make
+
+# As a sanity check, make sure the binary we built can be executed
+RUN /c2ffi/build/bin/c2ffi --help

Docker/Test-Build-Ubuntu-22.04.docker

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+FROM ubuntu:22.04
+ENV DEBIAN_FRONTEND=noninteractive
+RUN apt-get update && apt-get install -y g++ llvm-14 clang-14 libclang-14-dev libclang-cpp14-dev cmake
+
+# Copy the source into the Docker container
+RUN mkdir -p /c2ffi
+COPY / /c2ffi
+WORKDIR /c2ffi
+
+# Build c2ffi
+RUN cd /c2ffi && \
+        rm -rf build && mkdir -p build && cd build && \
+        cmake -DBUILD_CONFIG=Release .. && make
+
+# As a sanity check, make sure the binary we built can be executed
+RUN /c2ffi/build/bin/c2ffi --help