use nvm in Dockerfile to set the latest npm version

Dockerfile

@@ -11,7 +11,7 @@ RUN apt update && apt-get install -y firefox git wget ros-$ROS_DISTRO-rosbridge-
 ARG NODE_VERSION=14
 RUN wget -qO- https://raw.githubusercontent.com/nvm-sh/nvm/v0.38.0/install.sh | bash \
     && . $HOME/.nvm/nvm.sh \
-    && nvm install $NODE_VERSION && nvm alias default $NODE_VERSION \
+    && nvm install $NODE_VERSION --latest-npm && nvm alias default $NODE_VERSION \
     && npm install -g node-gyp
 
 RUN echo "source /opt/ros/$ROS_DISTRO/setup.bash" >> $HOME/.bashrc

test/build.bash

@@ -18,13 +18,10 @@ set -e
 
 pushd "$(dirname "$0")" > /dev/null
 
-echo -e "\e[1m\e[35mUPDATE NPM ------------------------------\e[0m"
-echo old version:
+echo -e "\e[1m\e[35mnode version:\e[0m"
+node -v
+echo -e "\e[1m\e[35mnpm version:\e[0m"
 npm -v
-npm i -g npm
-echo new version:
-npm -v
-echo -e "\e[1m\e[35m-----------------------------------------\e[0m"
 
 echo -e "\e[1m\e[35mnpm install\e[0m"
 # TODO remove this --legacy-peer-deps flag @babel/eslint-parser is updated to officially support eslint >=8