use docker hub image in docker-compose

docker-compose.yml

@@ -2,7 +2,7 @@ version: "3"
 
 services:
   webserver:
-    build: ./
+    image: m1k1o/blog
     container_name: blog_apache
     environment:
       TZ: Europe/Vienna
@@ -22,4 +22,4 @@ services:
       - mariadb:/var/lib/mysql
       - ./app/db:/docker-entrypoint-initdb.d:ro
 volumes:
-  mariadb:
+  mariadb: