Add basic caddy role

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

@@ -0,0 +1,17 @@
+{{ ansible_managed | comment }}
+
+{# helper variables and per-site defaults that we can't set in role defaults #}
+{% set domain_name    = item.domain_name %}
+{% set domain_aliases = item.domain_aliases | default("") %}
+{# assume optional features are off unless a vhost explicitly sets them #}
+{% set has_wordpress  = item.has_wordpress | default(false) %}
+{% set needs_php      = item.needs_php | default(false) %}
+{% set has_gitea      = item.has_gitea | default(false) %}
+
+{{ domain_name }} {
+    {% if has_gitea %}
+    reverse_proxy :3000
+    {% endif %}
+
+    import security-headers
+}