add docker utilities

docker/Dockerfile

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+# 
+# Development environment for libcanard, based on Ubuntu 20.04 Focal
+#
+# This software is distributed under the terms of the MIT License.
+# Copyright (c) 2021 UAVCAN Consortium.
+# Author: Kalyan Sriram <kalyan@coderkalyan.com>
+
+FROM ubuntu:focal
+
+ENV DEBIAN_FRONTEND noninteractive
+
+RUN apt-get update && apt-get -y upgrade
+RUN apt-get -y --no-install-recommends install \
+		build-essential cmake gcc-multilib g++-multilib \
+		clang-tidy-12 clang-format-12 \
+		gcc-avr avr-libc \
+		sudo curl git ca-certificates
+
+# borrowed from MAVSDK https://github.com/mavlink/MAVSDK/blob/main/docker/Dockerfile-Ubuntu-20.04
+RUN curl -L https://github.com/ncopa/su-exec/archive/dddd1567b7c76365e1e0aac561287975020a8fad.tar.gz | tar xvz && \
+	cd su-exec-* && make && mv su-exec /usr/local/bin && cd .. && rm -rf su-exec-*
+
+RUN useradd --shell /bin/bash -u 1001 -c "" -m user
+
+COPY entrypoint.sh /usr/local/bin/entrypoint.sh
+
+ENTRYPOINT ["/usr/local/bin/entrypoint.sh"]
+
+WORKDIR "/home/user/libcanard"

docker/entrypoint.sh

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+#!/usr/bin/env bash
+
+# Utility to use local user, taken from:
+# https://github.com/mavlink/MAVSDK/blob/main/docker/entrypoint.sh
+
+# Use LOCAL_USER_ID if passed in at runtime.
+
+if [ -n "${LOCAL_USER_ID}" ]; then
+    echo "Starting with UID: $LOCAL_USER_ID"
+    usermod -u $LOCAL_USER_ID user
+    export HOME=/home/user
+    chown -R user:user $HOME
+
+    exec su-exec user "$@"
+else
+    exec "$@"
+fi

tools/run-docker.sh

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+#!/usr/bin/env sh
+
+dockerimage=libcanard
+
+docker run -it --rm -v $(pwd):/home/user/libcanard:z -e LOCAL_USER_ID=`id -u` $dockerimage "$@"