ubuntu 安装 yarn

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## install nodejs
curl -fsSL https://deb.nodesource.com/setup_lts.x | sudo -E bash -
apt-get install nodejs -y

## add repo for yarn
curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | sudo apt-key add -
echo "deb https://dl.yarnpkg.com/debian/ stable main" | sudo tee /etc/apt/sources.list.d/yarn.list

## install yarn
apt-get update
apt-get install yarn

## now we have it
yarn --version