Update Ubuntu18.04-build.yaml

.github/workflows/Ubuntu18.04-build.yaml

@@ -30,7 +30,7 @@ jobs:
           apt-get install -y sudo software-properties-common
       - name: Install ROS Melodic
         run: |
-          yes |sudo sh -c 'echo "deb http://packages.ros.org/ros/ubuntu $(lsb_release -sc) main" > /etc/apt/sources.list.d/ros-latest.list'
+          yes Y | sudo sh -c 'echo "deb http://packages.ros.org/ros/ubuntu $(lsb_release -sc) main" > /etc/apt/sources.list.d/ros-latest.list'
           sudo apt install curl
           curl -s https://raw.githubusercontent.com/ros/rosdistro/master/ros.asc | sudo apt-key add -
           sudo apt update