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bundle install

yarn install
--------------------
yarn の gpgが死んでるらしいので…
sudo su
root@si:/home/mastodon# curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add -
OK

ユーザに戻って
--------------------
mastodon@si:~$ sudo apt install yarn

再度
yarn install
して、

mastodon@si:~/live$ yarn install
yarn install v1.13.0
[1/6] Validating package.json...
[2/6] Resolving packages...
success Already up-to-date.
Done in 1.07s.

#updateメモ