heroku-mastodon-build

$ git push heroku master
error Command "webpack" not found.
$ heroku buildpacks:add https://github.com/heroku/heroku-buildpack-nodejs
  1. https://github.com/heroku/heroku-buildpack-apt
  2. https://github.com/heroku/heroku-buildpack-nodejs
  3. heroku/ruby
  4. heroku/nodejs

参考になりそうなページ:

https://mastodon.zunda.ninja/@zundan

https://github.com/zunda/mastodon/wiki/UpgradeInstanceOnHeroku