Update testing-host image and remove unnecessary build configuration

docker-compose.windows.yml

@@ -2,8 +2,7 @@ version: '3.8'
 services:
   coolify-testing-host:
     init: true
-    build:
-      dockerfile: Dockerfile
+    image: "ghcr.io/coollabsio/coolify-testing-host:latest"
     container_name: coolify-testing-host
     volumes:
       - //var/run/docker.sock://var/run/docker.sock