roles/caddy: improve vhost template

Support domain aliases that redirect to the main domain and allow
sites to say they are static sites where they only need a document
root.

roles/caddy/templates/etc/caddy/conf.d/vhost.j2

@@ -7,11 +7,29 @@
 {% set has_wordpress  = item.has_wordpress | default(false) %}
 {% set needs_php      = item.needs_php | default(false) %}
 {% set has_gitea      = item.has_gitea | default(false) %}
+{% set static_site    = item.static_site | default(false) %}
+
+{% if domain_aliases %}
+{#   domain_aliases is a string, so we split on space #}
+{%   for domain in domain_aliases | split (' ') %}
+{{ domain }} {
+    redir https://{{domain_name}}{uri}
+}
+{%   endfor %}
+{% endif %}
 
 {{ domain_name }} {
     {% if has_gitea %}
     reverse_proxy :3000
     {% endif %}
 
+    {% if static_site -%}
+    root * {{ item.document_root }}
+
+    encode zstd gzip
+
+    file_server
+    {% endif %}
+
     import security-headers
 }