change hedgedoc container names

closes #24

ansible/roles/hedgedoc/templates/docker-compose.yml.j2

@@ -9,6 +9,7 @@ networks:
 services:
   database:
     image: postgres:13.4-alpine
+    container_name: hedgedoc-database
     environment:
       - POSTGRES_USER=hedgedoc
       - POSTGRES_PASSWORD=password
@@ -18,8 +19,10 @@ services:
     restart: always
     networks:
       - internal
+
   app:
     image: quay.io/hedgedoc/hedgedoc:1.9.7
+    container_name: hedgedoc
     environment:
       - CMD_DB_URL=postgres://hedgedoc:password@database:5432/hedgedoc
       - CMD_DOMAIN={{ hedgedoc_domain }}