Tag nginx configs in roles as nginx

roles/arch32_mirror/tasks/main.yml

roles/archive/tasks/main.yml

roles/archweb/tasks/main.yml

roles/flyspray/tasks/main.yml

roles/grafana/tasks/main.yml

roles/kanboard/tasks/main.yml

roles/matrix/tasks/main.yml

roles/nginx/tasks/main.yml

roles/patchwork/tasks/main.yml

roles/phpinfo/tasks/main.yml

roles/planet/tasks/main.yml

roles/public_html/tasks/main.yml

roles/security_tracker/tasks/main.yml

roles/sources/tasks/main.yml

roles/syncrepo/tasks/main.yml

roles/zabbix-server/tasks/main.yml