fix ansible-lint errors

roles/nginx_docker/templates/docker-compose.yml.j2

@@ -0,0 +1,15 @@
+---
+services:
+
+  nginx:
+    image: nginx:{{ nginx_docker_image_tag }}
+    container_name: nginx
+    hostname: nginx
+    restart: unless-stopped
+    network_mode: host
+    volumes:
+      - "{{ nginx_docker_project_path }}/conf.d/:/etc/nginx/conf.d/:ro"
+      - "/var/log/nginx/:/var/log/nginx/:rw"
+{% for v in nginx_docker_custom_volumes %}
+      - {{ v.from}}:{{v.to}}:{{v.mode | default('rw')}}
+{% endfor %}