Update Dockerfile

Fix #None

Author: Minggang Wang

Dockerfile

@@ -8,7 +8,7 @@ RUN locale-gen en_US en_US.UTF-8 && update-locale LC_ALL=en_US.UTF-8 LANG=en_US.
 ENV LANG en_US.UTF-8
 
 RUN apt install -y gnupg2 lsb-release
-RUN curl http://repo.ros2.org/repos.key | apt-key add -
+RUN curl -s https://raw.githubusercontent.com/ros/rosdistro/master/ros.asc | apt-key add -
 RUN sh -c 'echo "deb [arch=amd64,arm64] http://packages.ros.org/ros2/ubuntu `lsb_release -cs` main" > /etc/apt/sources.list.d/ros2-latest.list'
 
 # Install prerequisites
@@ -39,7 +39,7 @@ RUN wget https://ci.ros2.org/view/packaging/job/packaging_linux/lastSuccessfulBu
     && tar xf ros2-package-linux-x86_64.tar.bz2
 
 # [Ubuntu 18.04]
-RUN export CHOOSE_ROS_DISTRO=crystal && rosdep install --default-yes --from-paths $ROS2_WS/ros2-linux/share --ignore-src --rosdistro $CHOOSE_ROS_DISTRO --skip-keys "console_bridge fastcdr fastrtps libopensplice67 libopensplice69 osrf_testing_tools_cpp poco_vendor rmw_connext_cpp rosidl_typesupport_connext_c rosidl_typesupport_connext_cpp rti-connext-dds-5.3.1 tinyxml_vendor tinyxml2_vendor urdfdom urdfdom_headers"
+RUN rosdep install --from-paths $ROS2_WS/ros2-linux/share --ignore-src --rosdistro dashing -y --skip-keys "console_bridge fastcdr fastrtps libopensplice67 libopensplice69 osrf_testing_tools_cpp poco_vendor rmw_connext_cpp rosidl_typesupport_connext_c rosidl_typesupport_connext_cpp rti-connext-dds-5.3.1 tinyxml_vendor tinyxml2_vendor urdfdom urdfdom_headers"
 
 RUN echo "source $ROS2_WS/ros2-linux/local_setup.bash" >> $HOME/.bashrc