Crystal ros_core using rosinstall_generator

Dockerfile

ARG FROM_IMAGE=ubuntu:bionic
FROM $FROM_IMAGE

# setup timezone
RUN echo 'Etc/UTC' > /etc/timezone && \
    ln -s /usr/share/zoneinfo/Etc/UTC /etc/localtime && \
    apt-get update && apt-get install -q -y tzdata && rm -rf /var/lib/apt/lists/*

# install packages
RUN apt-get update && apt-get install -q -y \
    bash-completion \
    dirmngr \
    gnupg2 \
    lsb-release \
    python3-pip \
    && rm -rf /var/lib/apt/lists/*

# setup keys
RUN apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 421C365BD9FF1F717815A3895523BAEEB01FA116

# setup sources.list
RUN echo "deb http://packages.ros.org/ros2/ubuntu `lsb_release -sc` main" > /etc/apt/sources.list.d/ros2-latest.list

# setup environment
ENV LANG C.UTF-8
ENV LC_ALL C.UTF-8

# install bootstrap tools
RUN apt-get update && apt-get install --no-install-recommends -y \
    git \
    python3-colcon-common-extensions \
    python3-rosdep \
    python3-vcstool \
    && rm -rf /var/lib/apt/lists/*

# install python packages
RUN pip3 install -U \
    rosinstall_generator

# bootstrap rosdep
RUN rosdep init \
    && rosdep update

# clone source
ENV ROS2_WS /opt/ros2_ws
RUN mkdir -p $ROS2_WS/src
WORKDIR $ROS2_WS

RUN rosinstall_generator ros_core --rosdistro crystal --deps > ros_core.install && \
    vcs import src < ros_core.install

RUN rosdep update \
    && apt-get -qq update \
    && rosdep install \
      --from-paths src \
      --ignore-src \
      --skip-keys "rti-connext-dds-5.3.1 libopensplice69" \
      --rosdistro crystal -y
RUN colcon build