Fix caddy forward_auth settings for authentik

The snippet will now set the correct Host for the next hop and keep the
original site in the X-Forward-Auth-Host. The authentik caddy-site will
then put the X-Forward-Auth-Host into the X-Forwarded-Host (which would
normally be the authentik host/domain). Authentik is able to handle the
X-Forwarded-Host header.

playbooks/roles/caddy/templates/Caddyfile.j2

@@ -1,7 +1,7 @@
 {
 	email {{ admin_email }}
 
-    metrics
+	metrics
 
 	servers {
 		strict_sni_host on
@@ -11,9 +11,9 @@
 import /etc/caddy/snippets
 
 http://{{ host_vpn.domain }} {
-    import vpn_only
+	import vpn_only
 
-    metrics
+	metrics
 }
 
 *.serguzim.me {