add allow plugins to fix hanging composer docker container

Author: milanbombschliip

composer.json

@@ -32,5 +32,10 @@
 	},
 	"scripts": {
 		"lint": "phpcs --standard=phpcs.xml"
+	},
+	"config": {
+		"allow-plugins": {
+			"dealerdirect/phpcodesniffer-composer-installer": true
+		}
 	}
 }