r/victoria-metrics-nginx: Add reverse proxy for V-M

The *victoria-metrics-nginx* role configures *nginx* as a reverse proxy
for Victoria Metrics.

roles/victoria-metrics-nginx/tasks/main.yml

@@ -0,0 +1,9 @@
+- name: ensure nginx is configured to proxy for victoria metrics
+  template:
+    src: victoria-metrics.nginx.conf.j2
+    dest: /etc/nginx/conf.d/victoria-metrics.conf
+    mode: u=rw,go=r
+  notify:
+  - reload nginx
+  tags:
+  - nginx-config