message: fix(ci): add explicit nvm use statement
  Apparently, weird things happen otherwise when running for one
  Node.js version on a host and then later a different Node.js version
  on the same host.
diff: @@ -7,6 +7,7 @@ if [ "$OS" != "Windows_NT" ]; then
  export NVM_DIR="$HOME/.nvm"
  echo "Setting NVM environment home: $NVM_DIR"
  [ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh"
  + nvm use $NODE_JS_VERSION
  fi
  echo "Using node version:"
  