updated ros ppa adder

Author: Tomas Baca

resources/scripts/add_ros_ppa.sh

@@ -15,6 +15,8 @@ sudo curl -sSL https://raw.githubusercontent.com/ros/rosdistro/master/ros.key -o
 echo "deb [arch=$(dpkg --print-architecture) signed-by=/usr/share/keyrings/ros-archive-keyring.gpg] http://packages.ros.org/ros2/ubuntu $(. /etc/os-release && echo $UBUNTU_CODENAME) main" | sudo tee /etc/apt/sources.list.d/ros2.list > /dev/null
 
 sudo apt-get -y update
+
+sudo rosdep init || echo "$0: rosdep already initialized"
 rosdep update
 
 echo "$0: ROS2 PPA added"