Add Alter The Rails Setup Script as a Rails TIL

rails/alter-the-rails-setup-script.md

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+# Alter The Rails Setup Script
+
+When you generate a new Rails app, a set of scripts are put in the `bin/`
+folder of your new app. These _bin scripts_ are ruby scripts that you can use
+to run `rails` commands, `rake` commands, as well as `setup` your rails
+project.
+
+These scripts can be modified like you'd modify any other ruby code.
+
+In fact, the `setup` scripts encourages you to modify it by providing an
+example of an additional setup step you can add.
+
+```bash
+#!/usr/bin/env ruby
+require "fileutils"
+
+# ...
+
+FileUtils.chdir APP_ROOT do
+  # This script is a way to set up or update your development environment automatically.
+  # This script is idempotent, so that you can run it at any time and get an expectable outcome.
+  # Add necessary setup steps to this file.
+
+  puts "\n== Installing dependencies =="
+  system! "gem install bundler --conservative"
+  system("bundle check") || system!("bundle install")
+
+  # puts "\n== Copying sample files =="
+  # unless File.exist?("config/database.yml")
+  #   FileUtils.cp "config/database.yml.sample", "config/database.yml"
+  # end
+
+  # ...
+end
+```
+
+There are several steps built in, but it provides an example of how you can
+copy a sample YAML file to be the actual version of that YAML file.