Create a prototype for generating the Rails application using Docker

The goal of this project is to allow developers to generate a new Rails
application without having to install Ruby on their machine.

This is achieved by using Docker to generate the Rails application.

Author: rafaelfranca

Dockerfile

@@ -0,0 +1,5 @@
+ARG RUBY_VERSION=3.2.3
+FROM ruby:${RUBY_VERSION}
+ARG RAILS_VERSION
+# Install Rails based on the version specified but if not specified, install the latest version.
+RUN if [ -z "$RAILS_VERSION" ] ; then gem install rails ; else gem install rails -v $RAILS_VERSION ; fi

README.md

@@ -0,0 +1,17 @@
+You can use this repository to generate a new Rails application without having to install Ruby on your machine.
+
+It works by using Docker to generate the Rails application for you. Docker takes care of installing the right Ruby and
+Rails versions for you, so you don't have to worry about it.
+
+## Prerequisites
+
+You need to have Docker installed on your machine. You can find instructions on how to install Docker on your machine
+[here](https://docs.docker.com/engine/install/).
+
+## Usage
+
+To generate a new Rails application, you can run the following command:
+
+```bash
+bin/rails-new myapp
+```

bin/rails-new

@@ -0,0 +1,20 @@
+#!/usr/bin/env bash
+
+# This script is to generate a new Rails application using the Dockerfile in this repository.
+
+# The first argument is the name of the new Rails application.
+
+# Ruby version variable
+RUBY_VERSION=3.2.3
+
+# Rails version variable
+RAILS_VERSION=7.1.3
+
+# Build the image
+docker build \
+  --build-arg RUBY_VERSION=$RUBY_VERSION \
+  --build-arg RAILS_VERSION=$RAILS_VERSION \
+  -t rails-new-$RUBY_VERSION-$RAILS_VERSION .
+
+# Run the image
+docker run -v $(pwd):/$(pwd) -w $(pwd) rails-new-$RUBY_VERSION-$RAILS_VERSION rails new $1