r/minio-nginx: Reverse proxy for MinIO

The *minio-nginx* role configures nginx to proxy for MinIO.  It uses the
"subdomain" pattern, as described in [Configure NGINX Proxy for MinIO
Server][0]; the S3 API and the console UI are accessible through
different domain names.

[0]: https://min.io/docs/minio/linux/integrations/setup-nginx-proxy-with-minio.html

roles/minio-nginx/handlers/main.yml

@@ -0,0 +1,4 @@
+- name: reload nginx
+  service:
+    name: nginx
+    state: reloaded