Squashed 'external/toxcore/c-toxcore/' content from commit 67badf69

git-subtree-dir: external/toxcore/c-toxcore
git-subtree-split: 67badf69416a74e74f6d7eb51dd96f37282b8455

other/docker/circleci/Dockerfile

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+################################################
+# cmake-asan
+FROM ubuntu:20.04
+
+RUN apt-get update && \
+ DEBIAN_FRONTEND="noninteractive" apt-get install -y --no-install-recommends \
+ clang \
+ cmake \
+ libconfig-dev \
+ libgtest-dev \
+ libopus-dev \
+ libsodium-dev \
+ libvpx-dev \
+ llvm-dev \
+ ninja-build \
+ pkg-config \
+ && apt-get clean \
+ && rm -rf /var/lib/apt/lists/*
+
+COPY entrypoint.sh /
+RUN ["chmod", "755", "/entrypoint.sh"]
+
+WORKDIR /home/builder
+RUN groupadd -r -g 1000 builder \
+ && useradd --no-log-init -r -g builder -u 1000 builder \
+ && chown builder:builder /home/builder
+USER builder
+
+ENV CC=clang CXX=clang++
+ENTRYPOINT ["/entrypoint.sh"]