How to download and setup dockerfile-rails
Open terminal and run command
                                            git clone https://github.com/rubys/dockerfile-rails.git
                                        
                                        git clone is used to create a copy or clone of dockerfile-rails repositories.
                                        You pass git clone a repository URL. it supports a few different network protocols and corresponding URL formats.
Also you may download zip file with dockerfile-rails https://github.com/rubys/dockerfile-rails/archive/master.zip
Or simply clone dockerfile-rails with SSH
                                            [email protected]:rubys/dockerfile-rails.git                                    
                                    If you have some problems with dockerfile-rails
You may open issue on dockerfile-rails support forum (system) here: https://github.com/rubys/dockerfile-rails/issuesSimilar to dockerfile-rails repositories
Here you may see dockerfile-rails alternatives and analogs
rails discourse gitlabhq devise diaspora spree activeadmin kaminari simple_form factory_bot classroom textbook-curriculum github-ds diplomat awesome-opensource-apps acts_as_api browserify-rails mumuki-laboratory react-rails brakeman octicons mailcatcher cancancan administrate refinerycms simplecov webpacker suspenders buffalo graphql-ruby