add option to force ssl

config/environments/production.rb

@@ -42,7 +42,10 @@ Rails.application.configure do
   # config.action_cable.allowed_request_origins = [ 'http://example.com', /http:\/\/example.*/ ]
 
   # Force all access to the app over SSL, use Strict-Transport-Security, and use secure cookies.
-  # config.force_ssl = true
+  config.force_ssl = (ENV["ENABLE_SSL"] == "true")
+
+  # Force SSL for loadbalancer configurations.
+  config.force_ssl = true if ENV["LOADBALANCER_ENDPOINT"].present? && ENV["LOADBALANCER_SECRET"].present?
 
   # Use the lowest log level to ensure availability of diagnostic information
   # when problems arise.