Update Caddy Dockerfile

caddy/Caddyfile

@@ -1,3 +1,7 @@
+{
+    import conf/dynamic_dns.caddy
+}
+
 (unprotected) {
 	{args[0]}.{$SUBDOMAIN}.{$DOMAIN} {
 		log {

caddy/Dockerfile

@@ -1,8 +1,9 @@
-FROM caddy:2.7-builder AS builder
+FROM caddy:2.9-builder AS builder
 
 RUN xcaddy build \
-    --with github.com/caddy-dns/route53
+    --with github.com/caddy-dns/route53@v1.5.1 \
+    --with github.com/mholt/caddy-dynamicdns@7c818ab3fc3
 
-FROM caddy:2.7-alpine
+FROM caddy:2.9-alpine
 
 COPY --from=builder /usr/bin/caddy /usr/bin/caddy