use env vars for subdomain and domain in caddy

caddy/conf/auth.caddy

@@ -13,13 +13,12 @@
 			retry_attempts 3
 			retry_interval 10
 
-			base_auth_url https://authentik.rik.veenboer.xyz
-			metadata_url https://authentik.rik.veenboer.xyz/application/o/caddy/.well-known/openid-configuration
-			# metadata_url http://192.168.2.200:15000/caddy/.well-known/openid-configuration
+			base_auth_url https://authentik.{$SUBDOMAIN}.{$DOMAIN}
+			metadata_url https://authentik.{$SUBDOMAIN}.{$DOMAIN}/application/o/caddy/.well-known/openid-configuration
 		}
 		authentication portal myportal {
 			enable identity provider generic
-			cookie domain veenboer.xyz
+			cookie domain {$DOMAIN}
 			ui {
 				links {
 					"My Identity" "/whoami" icon "las la-user"
@@ -40,7 +39,7 @@
 			}
 		}
 		authorization policy mypolicy {
-			set auth url https://auth.rik.veenboer.xyz/oauth2/generic
+			set auth url https://auth.{$SUBDOMAIN}.{$DOMAIN}/oauth2/generic
 			allow roles authp/admin authp/user
 			validate bearer header
 			inject headers with claims

caddy/conf/dynamic_dns.caddy

@@ -2,7 +2,7 @@
 	dynamic_dns {
 		provider route53
 		domains {
-			veenboer.xyz. rik
+			{$DOMAIN}. {$SUBDOMAIN}
 		}
 		versions ipv4
 	}