hugo, add an image name so that all instances use it rather than recompiling every time.

Config/HugoExample/docker-compose.example.yml

@@ -6,6 +6,7 @@ services:
     container_name: hugo
     build:
       context: ./
+    image: hyperling-hugo:latest
     restart: always
     ports:
       - 8013:80   # Production minified files served using NGINX.