Add support for ua_middleware service. (#31)

* Add support for ua_middleware service.

* Remove spaces at end of line and file typo with auth_file env.

* More spaces to fix

* Opt for just one file for auth.

Author: bart88

src/Handler.php

@@ -157,6 +157,9 @@ public function modifySettingsFile()
                 "    \$settings['container_yamls'][] = 'modules/contrib/redis/example.services.yml';\n" .
                 "  }\n" .
                 "}\n" .
+                "\$settings['ua_middleware_service'] = array(\n" .
+                "   'auth' => getenv('UA_MIDDLEWARE_AUTH_FILE') ? file_get_contents(getenv('UA_MIDDLEWARE_AUTH_FILE')) : getenv('UA_MIDDLEWARE_AUTH'),\n" .
+                ");\n" .     
                 "/**\n * END SHEPHERD CONFIG\n */\n" .
                 "\n" .
                 "/**\n * START LOCAL CONFIG\n */\n" .