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docker run -it -p 3000:3000 -v $(pwd):/home/ubuntu/code ubuntu:18.04 bash

# dependencies
sudo apt-get update
sudo apt-get install sudo curl wget htop vim git
curl -sL https://deb.nodesource.com/setup_12.x | sudo -E bash -
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

sudo apt-get update
sudo apt-get install git-core zlib1g-dev build-essential libssl-dev libreadline-dev libyaml-dev libsqlite3-dev sqlite3 libxml2-dev libxslt1-dev libcurl4-openssl-dev software-properties-common libffi-dev nodejs yarn

# rbenv
cd /home/ubuntu
git clone https://github.com/rbenv/rbenv.git ~/.rbenv
echo 'export PATH="$HOME/.rbenv/bin:$PATH"' >> ~/.bashrc
echo 'eval "$(rbenv init -)"' >> ~/.bashrc
exec $SHELL

git clone https://github.com/rbenv/ruby-build.git ~/.rbenv/plugins/ruby-build
echo 'export PATH="$HOME/.rbenv/plugins/ruby-build/bin:$PATH"' >> ~/.bashrc
exec $SHELL

rbenv install 2.7.1
rbenv global 2.7.1
ruby -v

gem install rails -v 6.0.2.2
rbenv rehash
rails -v

sudo apt-get install libpq-dev
rails new myapp -d postgresql --api
cd myapp

rm Gemfile.lock
# add gem 'tzinfo-data' to Gemfile
bundle install

docker run -it -p 5432:5432 --user postgres -e POSTGRES_PASSWORD=123456 postgres
# add postgres connection into config/database.yml
rake db:create

rails server -p 3000

Resources: https://gorails.com/setup/ubuntu/18.04#ruby-rbenv