rbenv install 2.4.2
rbenv rehash

gem install bundler
bundle install --path vendor/bundle

node -v or nodejs -v

npm --version

sudo npm install -g yarn

git fetch
git checkbout master

yarn install

config/database.yml.example
config/secrets.yml.example
config/webpacker.yml.example

bundle exec rake db:create

bundle exec rake db:migrate

bundle exec rake db:seed

bundle exec rails s