Introduce setup rake tasks

Put what has to be done to have a working installation into one place instead
of spreading it to multiple files.

lib/tasks/setup.rake

@@ -0,0 +1,48 @@
+# frozen_string_literal: true
+
+require 'fileutils'
+
+namespace :setup do
+  task :configure do
+    puts 'Setting up the database configuration...'
+    copy_example_file('config/database.yml')
+    copy_example_file(".env.#{Rails.env}", 'dotenv.example')
+  end
+
+  desc 'Bootstrap the application'
+  task bootstrap: [:configure, :environment] do
+    puts 'Creating the database...'
+    begin
+      # Only do this if the database does not exist...
+      Rake::Task['db:version'].invoke
+      # rubocop:disable Style/RescueStandardError
+    rescue
+      # rubocop:enable Style/RescueStandardError
+      Rake::Task['db:create'].invoke
+      Rake::Task['db:setup'].invoke
+      Rake::Task['db:seed'].invoke
+    end
+
+    if Rails.env.test? || Rails.env.production?
+      puts 'Prepare assets'
+      Rake::Task['assets:clobber'].invoke
+      Rake::Task['assets:precompile'].invoke
+    end
+
+    if Rails.env.development?
+      puts 'Removing assets'
+      Rake::Task['assets:clobber'].invoke
+    end
+  end
+end
+
+def copy_example_file(example_file, source_file = nil)
+  if File.exist?(example_file) && !ENV['FORCE_EXAMPLE_FILES']
+    example_file = File.join(File.expand_path(File.dirname(__FILE__) + '/../..'), example_file)
+    puts "WARNING: You already have the config file #{example_file}, skipping..."
+  else
+    source_file ||= "#{example_file}.example"
+    puts "Creating #{example_file} from #{source_file}"
+    FileUtils.copy_file(source_file, example_file)
+  end
+end