1 - go to https://github.com/codespaces
2 - choose the blank template
3 - Create a .devcontainer folder
mkdir .devcontainer
4 - Add a devcontainer.json file inside
echo -e "{\n \"name\": \"Ruby and Rails\",\n \"image\": \"mcr.microsoft.com/devcontainers/ruby:0-3.1-bullseye\",\n \"postCreateCommand\": \"gem install rails\"\n}" > .devcontainer/devcontainer.json
5 - Rebuild container (cmd + shift + p > rebuild)
6 - run
rails new . -m https://raw.githubusercontent.com/troptropcontent/devcontainer_rails/main/template.rb --database=postgresql --css tailwind
7 - Rebuild container (cmd + shift + p > rebuild)
8 - rails s 🚀