Role service-nginx-meshviewer: add additional domains

Our meshes structure only supports two domains (internal/external).
This adds a list called `meshviewer_additional_domains` which will be
prefixed with `map.` and redirected to the main Meshviewer domain.

inventory/group_vars/monitoring

@@ -25,3 +25,6 @@ alertmanager_opts: "--web.external-url=https://{{ http_prometheus_prefix }}.{{ h
 
 yanic_blacklist:
   - 98ded0c5e0c0
+
+meshviewer_additional_domains:
+  - freifunk-wiesbaden.de

roles/service-nginx-meshviewer/templates/meshviewer_vhost.conf.j2

@@ -86,3 +86,28 @@ server {
 {% endif %}
 {% endif %}
 {% endfor %}
+
+{% if meshviewer_additional_domains is defined %}
+{% for domain in meshviewer_additional_domains %}
+server {
+    listen 80;
+    listen [::]:80;
+    server_name {{ http_meshviewer_prefix }}.{{ domain }};
+    return 301 https://{{ http_meshviewer_external }}$request_uri;
+
+    include /etc/nginx/snippets/letsencrypt-acme-challenge.conf;
+}
+
+server {
+    listen 443 ssl;
+    listen [::]:443 ssl;
+    server_name {{ http_meshviewer_prefix }}.{{ domain }};
+    return 301 https://{{ http_meshviewer_external }}$request_uri;
+
+    include /etc/nginx/snippets/letsencrypt-acme-challenge.conf;
+}
+{% if not loop.last %}
+
+{% endif %}
+{% endfor %}
+{% endif %}